Phosphatase

Here is a rage amulet found from a dungeon. Slight pulses of heat can be felt when touching it.
Perhaps it was crafted by a beginner elf blacksmith. At least that can be assumed when looking at it.
Maybe it's better to use it just as a tree ornament rather than as a source of power?
 

 
The ingredients used:
Resin from spruce
Aluminum foil
Turmeric powder
Sewing thread
 
Droplets of resin were collected by me. Then they were mixed together and shaped into a disk.
A strand of aluminum foil was wrapped around the disk while inserting the thread.
Turmeric powder was then spread onto the disk to give it orange color.
The resin disk was very sticky, so no glue was needed.
 

Here is a rage amulet found from a dungeon. Slight pulses of heat can be felt when touching it.
Perhaps it was crafted by a beginner elf blacksmith. At least that can be assumed when looking at it.
Maybe it's better to use it just as a tree ornament rather than as a source of power?
 

 
The ingredients used:
Resin from spruce
Aluminum foil
Turmeric powder
Sewing thread
 
Droplets of resin were collected by me. Then they were mixed together and shaped into a disk.
A strand of aluminum foil was wrapped around the disk while inserting the thread.
Turmeric powder was then spread onto the disk to give it orange color.
The resin disk was very sticky, so no glue was needed.
 

Happy 17th birthday Warspear Online! Here is a fabulous greeting card made from plethora of small screenshots!
 

”This could only happen in Arinar during the New Year’s celebration,” lamented a World Creation knight sent on an important mission by White Beard himself. The situation was tense as the warriors from the other islands had sold all the collected north runes to some rich person of unknown origin. Indeed, the snow elves were in constant danger if the magic of the north runes was not protecting them. For this reason, the knight was tirelessly searching for that scoundrel.
 

 
After a while, the knight finally found a suspicious rich-looking person.
 
”You there! Hand over the north runes, now!” the knight shouted.
 
”Nope, I paid a fair price from them!” the person responded.
 
The knight then unsheathed his fir-tree sword, but the person quickly said: ”Wait! I’ll give you the runes, but I also have a special offer for you.”
 
The knight calmed down and listened.
 

 
”I noticed that the weapon you are carrying with you is quite rare,” the person said. ”I would like to offer a pouchful of gold coins for it.”
 
The knight was happy that violence could be avoided, and the offer was also good, so he accepted it.
 
”Stop! You are being deceived!” shouted someone suddenly. An elven sorceress came running and told the knight: ”I’m so sorry, my Grinch minion stole my old staff and ran away.”
 
The knight was confused, but when he looked ahead, there was abruptly a grinning Grinch with an empty pouch.
 
”There was never money, just illusions,” the sorceress said. ”Please, allow me to deal with my minion and retrieve the runes.”
 

 
After handing over the runes to the knight, the sorceress once more apologized and then teleported the knight back to the Snow Elf Village.
 
Back in the village, the knight rushed to White Beard who, after hearing everything, gathered the residents of the village together to sort out the situation. Indeed, money had suddenly started to disappear from the people’s pockets, and there was unrest in the air. White Beard calmed the listeners and scolded those who had fallen victim to greed thus endangering the peace in the village.
 
White Beard thanked the knight for preventing chaos and said to everyone: ”Since you all owe to this man, he’ll receive all of your reward money!” The inhabitants of the village had ashamed expressions, and no one dared to complain, but to White Beard’s surprise even the knight seemed ashamed.
 
”I am no worthy of such a reward for I was blinded by the glimmer of money too,” the knight said.
 
White Beard understood what the knight meant, but he calmly shook his head and told the knight: ”Trust me, my experience in detecting who is deserving and who is not is comparable to none, and in you I could sense innocence of special kind.”
 
The knight understood and promised with teary eyes that the received money would bring joy and happiness to everyone in the Snow Elf Village. And so the New Year’s celebrations went happily on.
 

 

”This could only happen in Arinar during the New Year’s celebration,” lamented a World Creation knight sent on an important mission by White Beard himself. The situation was tense as the warriors from the other islands had sold all the collected north runes to some rich person of unknown origin. Indeed, the snow elves were in constant danger if the magic of the north runes was not protecting them. For this reason, the knight was tirelessly searching for that scoundrel.
 

 
After a while, the knight finally found a suspicious rich-looking person.
 
”You there! Hand over the north runes, now!” the knight shouted.
 
”Nope, I paid a fair price from them!” the person responded.
 
The knight then unsheathed his fir-tree sword, but the person quickly said: ”Wait! I’ll give you the runes, but I also have a special offer for you.”
 
The knight calmed down and listened.
 

 
”I noticed that the weapon you are carrying with you is quite rare,” the person said. ”I would like to offer a pouchful of gold coins for it.”
 
The knight was happy that violence could be avoided, and the offer was also good, so he accepted it.
 
”Stop! You are being deceived!” shouted someone suddenly. An elven sorceress came running and told the knight: ”I’m so sorry, my Grinch minion stole my old staff and ran away.”
 
The knight was confused, but when he looked ahead, there was abruptly a grinning Grinch with an empty pouch.
 
”There was never money, just illusions,” the sorceress said. ”Please, allow me to deal with my minion and retrieve the runes.”
 

 
After handing over the runes to the knight, the sorceress once more apologized and then teleported the knight back to the Snow Elf Village.
 
Back in the village, the knight rushed to White Beard who, after hearing everything, gathered the residents of the village together to sort out the situation. Indeed, money had suddenly started to disappear from the people’s pockets, and there was unrest in the air. White Beard calmed the listeners and scolded those who had fallen victim to greed thus endangering the peace in the village.
 
White Beard thanked the knight for preventing chaos and said to everyone: ”Since you all owe to this man, he’ll receive all of your reward money!” The inhabitants of the village had ashamed expressions, and no one dared to complain, but to White Beard’s surprise even the knight seemed ashamed.
 
”I am no worthy of such a reward for I was blinded by the glimmer of money too,” the knight said.
 
White Beard understood what the knight meant, but he calmly shook his head and told the knight: ”Trust me, my experience in detecting who is deserving and who is not is comparable to none, and in you I could sense innocence of special kind.”
 
The knight understood and promised with teary eyes that the received money would bring joy and happiness to everyone in the Snow Elf Village. And so the New Year’s celebrations went happily on.
 

 

”This could only happen in Arinar during the New Year’s celebration,” lamented a World Creation knight sent on an important mission by White Beard himself. The situation was tense as the warriors from the other islands had sold all the collected north runes to some rich person of unknown origin. Indeed, the snow elves were in constant danger if the magic of the north runes was not protecting them. For this reason, the knight was tirelessly searching for that scoundrel.
 

 
After a while, the knight finally found a suspicious rich-looking person.
 
”You there! Hand over the north runes, now!” the knight shouted.
 
”Nope, I paid a fair price from them!” the person responded.
 
The knight then unsheathed his fir-tree sword, but the person quickly said: ”Wait! I’ll give you the runes, but I also have a special offer for you.”
 
The knight calmed down and listened.
 

 
”I noticed that the weapon you are carrying with you is quite rare,” the person said. ”I would like to offer a pouchful of gold coins for it.”
 
The knight was happy that violence could be avoided, and the offer was also good, so he accepted it.
 
”Stop! You are being deceived!” shouted someone suddenly. An elven sorceress came running and told the knight: ”I’m so sorry, my Grinch minion stole my old staff and ran away.”
 
The knight was confused, but when he looked ahead, there was abruptly a grinning Grinch with an empty pouch.
 
”There was never money, just illusions,” the sorceress said. ”Please, allow me to deal with my minion and retrieve the runes.”
 

 
After handing over the runes to the knight, the sorceress once more apologized and then teleported the knight back to the Snow Elf Village.
 
Back in the village, the knight rushed to White Beard who, after hearing everything, gathered the residents of the village together to sort out the situation. Indeed, money had suddenly started to disappear from the people’s pockets, and there was unrest in the air. White Beard calmed the listeners and scolded those who had fallen victim to greed thus endangering the peace in the village.
 
White Beard thanked the knight for preventing chaos and said to everyone: ”Since you all owe to this man, he’ll receive all of your reward money!” The inhabitants of the village had ashamed expressions, and no one dared to complain, but to White Beard’s surprise even the knight seemed ashamed.
 
”I am no worthy of such a reward for I was blinded by the glimmer of money too,” the knight said.
 
White Beard understood what the knight meant, but he calmly shook his head and told the knight: ”Trust me, my experience in detecting who is deserving and who is not is comparable to none, and in you I could sense innocence of special kind.”
 
The knight understood and promised with teary eyes that the received money would bring joy and happiness to everyone in the Snow Elf Village. And so the New Year’s celebrations went happily on.
 

 

From where does joy originate?
To give this mystery some light
let’s recite a spell while we wait
about the deep origins of delight:
 
”The joy came from something bright,
from wars won, from battles glorious.
It came from unexpected rewards and
from lively events that made us happy.
It is born even for the guild placing 15th
and soon it will arise for the anniversary.
Its origins are in a jewel called Warspear
so let us rejoice when we are all Online.”

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

1. Introduction
 
Here, even in our academy, the signs of imperishability are a common sight. They are most often used during risky amplification processes where the magical energy stored in special spheres is conducted through the signs of imperishability to various objects to prevent these objects from disintegrating [1]. The most common objects that are being amplified are different types of armors, weapons and accessories but also important documents and such are being amplified to protect them from damage. Even other humans have been tried to amplify, although, these experiments have ended terribly even when signs were used [2]. However, no one really knows how the signs of imperishabilty actually work even though this subject has interested many. The purpose of this review is to investigate what has been written and what is known of the signs and, possibly, also understand the mechanisms behind their way of acting.
 
2. Studies regarding the signs of imperishability
 
Master Berchtwald von Beleswelt writes in his tractate The mystery of the signs of imperishability: How are they created? that as the crafting methods of the signs of imperishability are known only to the craftsmen of Almahad there has been multiple attempts by the masters of Academy of Magic of Altgard to create their own signs but unfortunately these attempts have all failed [3]. Master Berchtwald, who took part in one of these said attempts, writes that even though they were able to replicate the structure of a sign of imperishability they couldn’t figure out which materials were used to create the original signs. Thus, the replicas they made broke prematurely during the amplification process and couldn’t protect the target items or if they didn’t break, they just absorbed the magical energy instead of conducting it forward [3].
 
Interestingly, alchemist Teresan writes in his research report A research on the properties of various rare minerals about a certain mineral called ”zaubelite”. Said mineral has both great durability and great conductivity of magical energy which means that it could be one of the materials used in the signs of imperishability [4]. However, zaubelite is quite rare and somewhat unstable mineral meaning that it can’t be the main component [4]. This seems to be clear especially when the amount of signs sold by the merchants of Chainless League is taken into account.
 
Nevertheless, the signs of imperishability are not just mere triangles made of some mineral. This has been proved by druid Dael-Wenn in her recent study The new revolutionary uses of the signs of imperishability: staves where she experimented the use of signs as staff building material. As one could expect, the staff heads made of reforged signs of imperishability fell apart after first spellcast, similarly to what happens after amplification to normal signs, but at same time they were incredibly effective at conducting the magic power of the caster [5]. However, what is interesting is that certain types of magic were altered when cast through the experimental staff heads which has been reported before to happen only when the staff heads were imbued with magical power beforehand [5, 6]. This means that the signs are indeed modified with magic. However, Dael-Wenn was not able to determine the purpose of this magic nor remove it [5]. Perhaps it’s used to strengthen the properties of the signs of imperishability or perhaps it causes the signs to break up after the first use or perhaps its purpose is to do something else?
 
3. Conclusions
 
The reason why it would be important to understand how the signs of imperishability work and how they are made is that if we were able to figure those out, we would be able to produce our own signs of imperishability which would allow us to amplify our warriors for a much cheaper price granting us an upper hand in this war. There are also other possibilities, for example, if we found a way to remove the modifier spell and it turned out that the purpose of the spell was to make the signs to break up after one use, we would be able to modify the signs we buy so that one sign could be used multiple times before breaking up which would allow us to buy less signs or alternatively amplify more. On a side note, this would allow us to use the experimental staves developed by Dael-Wenn much more efficiently as well.
 
Studying the signs of the imperishability can easily be lucrative work and thus more resources should be directed to this sector. At the time when the replica signs of imperishability were crafted in Altgard’s Academy of Magic there was no knowledge about the modifier spell in the signs meaning that now the research could just begin. Anyway, finding a way to remove the modifier spell should be prioritized as doing so could be a great success or at least it would give us useful information about the nature of the spell. However, as none of the above-mentioned methods is guaranteed to bear fruit, the possibility of organizing an expedition to the lands of Almahad should be considered as well, as the craftsmen of Chainless League have all the answers regarding the signs of imperishability.
 
References
 
1. Trannor. The basics of warrior life part 3: amplifications and enchantments.
2. Albrecht, Manfred & Ann-Lywe. The enhanced humans: a report.
3. Berchtwald. The mystery of the signs of imperishability: How are they created?
4. Teresan. A research on the properties of various rare minerals.
5. Dael-Wenn. The new revolutionary uses of the signs of imperishability: staves.
6. Wuldar & Terhene. A report on the altered magic achieved through the use of precharged crystals.

Friends!
 
Who would’ve thought that the usual items from your bags contain so many wonderful stories? The jury dived deep into the details of the combat troubles, romantic tragedies and comedic coincidences, and is finally ready to announce the winners!
 
Audience choice prize, 10.000 Miracle Coins:  @Gladiator - “What's In My Pockets? An Extra Pocket!”.
 
Awarded with the title of a pre-level master and 5.000 Miracle Coins are:
@rafa9876 - “The Secrets of Magic”;
@Kirby - “The Gift From A Strange”.
 
The title of level 3 master and 15.000 Miracle coins + Battle pass of the 11th activity season + bronze forum badge:
@Higgings - “The Curse of the Almighty”.
 
The title of level 2 master and 20.000 Miracle coins + Battle pass of the 11th activity season + silver forum badge:
@Stillron - “The Legendary Life Scroll”.
 
The title of level 1 master and 30.000 Miracle coins + Battle pass of the 11th activity season + gold forum badge:
@Phosphatase - “The puzzling signs of imperishability: a review”.
 
As gratitude, other participants whose works did not break the rules of the contest, will receive the incentive prize of 15 Surprise Chest!
 
We thank you for participating and look forward to your papers in the future literary contest!
AIGRIND

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

Superb topic.
Can you please update this post and add the books dropped from castle dungeons please?

1. Introduction
 
Here, even in our academy, the signs of imperishability are a common sight. They are most often used during risky amplification processes where the magical energy stored in special spheres is conducted through the signs of imperishability to various objects to prevent these objects from disintegrating [1]. The most common objects that are being amplified are different types of armors, weapons and accessories but also important documents and such are being amplified to protect them from damage. Even other humans have been tried to amplify, although, these experiments have ended terribly even when signs were used [2]. However, no one really knows how the signs of imperishabilty actually work even though this subject has interested many. The purpose of this review is to investigate what has been written and what is known of the signs and, possibly, also understand the mechanisms behind their way of acting.
 
2. Studies regarding the signs of imperishability
 
Master Berchtwald von Beleswelt writes in his tractate The mystery of the signs of imperishability: How are they created? that as the crafting methods of the signs of imperishability are known only to the craftsmen of Almahad there has been multiple attempts by the masters of Academy of Magic of Altgard to create their own signs but unfortunately these attempts have all failed [3]. Master Berchtwald, who took part in one of these said attempts, writes that even though they were able to replicate the structure of a sign of imperishability they couldn’t figure out which materials were used to create the original signs. Thus, the replicas they made broke prematurely during the amplification process and couldn’t protect the target items or if they didn’t break, they just absorbed the magical energy instead of conducting it forward [3].
 
Interestingly, alchemist Teresan writes in his research report A research on the properties of various rare minerals about a certain mineral called ”zaubelite”. Said mineral has both great durability and great conductivity of magical energy which means that it could be one of the materials used in the signs of imperishability [4]. However, zaubelite is quite rare and somewhat unstable mineral meaning that it can’t be the main component [4]. This seems to be clear especially when the amount of signs sold by the merchants of Chainless League is taken into account.
 
Nevertheless, the signs of imperishability are not just mere triangles made of some mineral. This has been proved by druid Dael-Wenn in her recent study The new revolutionary uses of the signs of imperishability: staves where she experimented the use of signs as staff building material. As one could expect, the staff heads made of reforged signs of imperishability fell apart after first spellcast, similarly to what happens after amplification to normal signs, but at same time they were incredibly effective at conducting the magic power of the caster [5]. However, what is interesting is that certain types of magic were altered when cast through the experimental staff heads which has been reported before to happen only when the staff heads were imbued with magical power beforehand [5, 6]. This means that the signs are indeed modified with magic. However, Dael-Wenn was not able to determine the purpose of this magic nor remove it [5]. Perhaps it’s used to strengthen the properties of the signs of imperishability or perhaps it causes the signs to break up after the first use or perhaps its purpose is to do something else?
 
3. Conclusions
 
The reason why it would be important to understand how the signs of imperishability work and how they are made is that if we were able to figure those out, we would be able to produce our own signs of imperishability which would allow us to amplify our warriors for a much cheaper price granting us an upper hand in this war. There are also other possibilities, for example, if we found a way to remove the modifier spell and it turned out that the purpose of the spell was to make the signs to break up after one use, we would be able to modify the signs we buy so that one sign could be used multiple times before breaking up which would allow us to buy less signs or alternatively amplify more. On a side note, this would allow us to use the experimental staves developed by Dael-Wenn much more efficiently as well.
 
Studying the signs of the imperishability can easily be lucrative work and thus more resources should be directed to this sector. At the time when the replica signs of imperishability were crafted in Altgard’s Academy of Magic there was no knowledge about the modifier spell in the signs meaning that now the research could just begin. Anyway, finding a way to remove the modifier spell should be prioritized as doing so could be a great success or at least it would give us useful information about the nature of the spell. However, as none of the above-mentioned methods is guaranteed to bear fruit, the possibility of organizing an expedition to the lands of Almahad should be considered as well, as the craftsmen of Chainless League have all the answers regarding the signs of imperishability.
 
References
 
1. Trannor. The basics of warrior life part 3: amplifications and enchantments.
2. Albrecht, Manfred & Ann-Lywe. The enhanced humans: a report.
3. Berchtwald. The mystery of the signs of imperishability: How are they created?
4. Teresan. A research on the properties of various rare minerals.
5. Dael-Wenn. The new revolutionary uses of the signs of imperishability: staves.
6. Wuldar & Terhene. A report on the altered magic achieved through the use of precharged crystals.

I absolutely love this very creative approach! As someone who has read a lot of research papers and reviews, this really reminiscent one. Very well done!
Good luck publishing your review in the very reputable "Arinar's Journal of Alchemy and Magic" 

1. Introduction
 
Here, even in our academy, the signs of imperishability are a common sight. They are most often used during risky amplification processes where the magical energy stored in special spheres is conducted through the signs of imperishability to various objects to prevent these objects from disintegrating [1]. The most common objects that are being amplified are different types of armors, weapons and accessories but also important documents and such are being amplified to protect them from damage. Even other humans have been tried to amplify, although, these experiments have ended terribly even when signs were used [2]. However, no one really knows how the signs of imperishabilty actually work even though this subject has interested many. The purpose of this review is to investigate what has been written and what is known of the signs and, possibly, also understand the mechanisms behind their way of acting.
 
2. Studies regarding the signs of imperishability
 
Master Berchtwald von Beleswelt writes in his tractate The mystery of the signs of imperishability: How are they created? that as the crafting methods of the signs of imperishability are known only to the craftsmen of Almahad there has been multiple attempts by the masters of Academy of Magic of Altgard to create their own signs but unfortunately these attempts have all failed [3]. Master Berchtwald, who took part in one of these said attempts, writes that even though they were able to replicate the structure of a sign of imperishability they couldn’t figure out which materials were used to create the original signs. Thus, the replicas they made broke prematurely during the amplification process and couldn’t protect the target items or if they didn’t break, they just absorbed the magical energy instead of conducting it forward [3].
 
Interestingly, alchemist Teresan writes in his research report A research on the properties of various rare minerals about a certain mineral called ”zaubelite”. Said mineral has both great durability and great conductivity of magical energy which means that it could be one of the materials used in the signs of imperishability [4]. However, zaubelite is quite rare and somewhat unstable mineral meaning that it can’t be the main component [4]. This seems to be clear especially when the amount of signs sold by the merchants of Chainless League is taken into account.
 
Nevertheless, the signs of imperishability are not just mere triangles made of some mineral. This has been proved by druid Dael-Wenn in her recent study The new revolutionary uses of the signs of imperishability: staves where she experimented the use of signs as staff building material. As one could expect, the staff heads made of reforged signs of imperishability fell apart after first spellcast, similarly to what happens after amplification to normal signs, but at same time they were incredibly effective at conducting the magic power of the caster [5]. However, what is interesting is that certain types of magic were altered when cast through the experimental staff heads which has been reported before to happen only when the staff heads were imbued with magical power beforehand [5, 6]. This means that the signs are indeed modified with magic. However, Dael-Wenn was not able to determine the purpose of this magic nor remove it [5]. Perhaps it’s used to strengthen the properties of the signs of imperishability or perhaps it causes the signs to break up after the first use or perhaps its purpose is to do something else?
 
3. Conclusions
 
The reason why it would be important to understand how the signs of imperishability work and how they are made is that if we were able to figure those out, we would be able to produce our own signs of imperishability which would allow us to amplify our warriors for a much cheaper price granting us an upper hand in this war. There are also other possibilities, for example, if we found a way to remove the modifier spell and it turned out that the purpose of the spell was to make the signs to break up after one use, we would be able to modify the signs we buy so that one sign could be used multiple times before breaking up which would allow us to buy less signs or alternatively amplify more. On a side note, this would allow us to use the experimental staves developed by Dael-Wenn much more efficiently as well.
 
Studying the signs of the imperishability can easily be lucrative work and thus more resources should be directed to this sector. At the time when the replica signs of imperishability were crafted in Altgard’s Academy of Magic there was no knowledge about the modifier spell in the signs meaning that now the research could just begin. Anyway, finding a way to remove the modifier spell should be prioritized as doing so could be a great success or at least it would give us useful information about the nature of the spell. However, as none of the above-mentioned methods is guaranteed to bear fruit, the possibility of organizing an expedition to the lands of Almahad should be considered as well, as the craftsmen of Chainless League have all the answers regarding the signs of imperishability.
 
References
 
1. Trannor. The basics of warrior life part 3: amplifications and enchantments.
2. Albrecht, Manfred & Ann-Lywe. The enhanced humans: a report.
3. Berchtwald. The mystery of the signs of imperishability: How are they created?
4. Teresan. A research on the properties of various rare minerals.
5. Dael-Wenn. The new revolutionary uses of the signs of imperishability: staves.
6. Wuldar & Terhene. A report on the altered magic achieved through the use of precharged crystals.

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

I put those numbers in a coordinate system and noticed that they form lines and based on those lines I got the following formulas:
 
Shap shadow lv1:
(848*x+52383)/599=y
lv2:
(938*x+91762)/599=y
lv3:
(1029*x+124517)/599=y
lv4:
(1150*x+146039)/599=y
where x=mdmg and y=Sharp shadow dmg
 

 
These formulas don't seem to always give 100% correct answers but I hope this helps anyways.

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.
 
 

Non-class skill books are expert skill books which any class can use. Although, unlike ordinary expert skill books, these skill books can not be upgraded. Most of them grant only small improvements but few of them are actually quite powerful. At the moment, there are 73 non-class skill books, 70 of which are passive and three that are active. The only requirements to use these books are a character level of 18 and an empty combat kit slot which means that these books won't consume the space meant for normal expert skill books. Every character has 15 combat kit slots in total, but there is no limit to the number of books a single character can have in an inactive form. Non-class skill books can be obtained by killing raid bosses, participating in guild events and completing dungeons during seasonal special events. Some books can also be obtained from physical chests that require special keys. Non-class skill books are more than rare but they are also worth of millions which means that if you ever happen drop one and sell it, you won't have to worry about gold for a while. This guide valid for the game version of 13.3.3.
 
So, here is the list of all current non-class skill books:
 
The books of Ayvondil
 
Books from the raid bosses of Ayvondil:
 
  Book of Enhanced Critical Damage
 
Increases character's "critical hit strength" parameter by 10 %.
Type: Passive
Drops from: Raid boss Black Elm
 
  Book of Enhanced Critical Healing
 
Increases character's healing done by critical heals by 10 %.
Type: passive
Drops from: Raid boss Black Elm
 
  Book of Physical Protection
 
Increases the numerical value of character's physical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magical Protection
 
Increases the numerical value of character's magical defense by 10 %.
Type: Passive
Drops from: Raid boss Engineer
 
  Book of Magic Resistance
 
Decreases the duration of debuffs applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Captain Giant Octopus
 
  Book of Magic Extension
 
Increases the duration of positive effects from skills and relics applied to the character by the percentage of the character's magical defense. However, the cap of this effect is 50 %.
Type: Passive
Drops from: Raid boss Orcinus
 
Books from the castle dungeons of Ayvondil:
 
  Book of Hidden Dodge
 
Increases character's and all party members' "dodge" parameter by 8 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Rejected King's Fortress (Forest's Heart castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Tactical Strength
 
Increases character's and all party members' physical and magical power by 10 % when party's combined health level is less than 40 %.
Type: Passive
Drops from: Dungeon Past Priest's Temple (Jaguar's Den castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Phenomenal Lethality
 
Increases character's and all party members' "critical hit" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Dragon Knight's Stronghold (Dragon Ness castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Amazing Accuracy
 
Increases character's and all party members' "accuracy" parameter by 6 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Knowing's Bastion (Sky Sanctuary castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
  Book of Lethal Penetration
 
Increases character's and all party members' "penetration" parameter by 5 % when party is in battle with five or more opponents.
Type: Passive
Drops from: Dungeon Codex Servants' Catacombs (Sea Turtle castle)
Notes: This book won't work if you are alone. You must have at least one party member at the location.
 
Books from the guild events of Ayvondil:
 
  Book of Power of Life
 
Increases character's maximum health by 6 % and health regeneration by 15 %.
Type: Passive
Drops from: The guild event to kill Rottung Air (Wild Hunt)
 
  Book of Power of Spirit
 
Increases character's maximum energy by 10 % and energy regeneration by 10 %.
Type: Passive
Drops from: The guild event to kill Nocturna (Music of Magic)
 
Books from the pirate chests of the sunken ships in the V sector of Ayvondil:
 
  Book of Might of the Depths
 
Increases character's "depths' fury" parameter by 10 % and movement speed in the Underwater Territory by 10 %.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: This book works only in the Underwater Territory and nowhere else.
 
  Book of Absolute Strength
 
Absorbs received critical hit damage if the damage would have killed the player character.
Type: Passive
Drops from: Pirate Chests of the sunken ships (Pirate Chest Key is required to open a chest)
Notes: Great for Mythical Sea Tramps Lair and Champions Coliseum dungeons as you can say good bye to instakill critical hits.
 
The books of Almahad
 
Books from the tombs, outposts and towers of Almahad:
 
Book of Critical Might
 
Increases character's "critical hit strength" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Tombs of the Golden Sands
 
Book of Deadly Precision
 
Increases character's "critical hit strength" parameter by 1 % for every 10 % of the character's "critical hit" parameter.
Type: Passive
Drops from: Tombs every time when the player character has completed 1250 runs
Notes: As the maximum critical hit is 50-53 %, this book can give 5 % of critical hit strength at maximum.
 
Book of Battle Humility
 
Increases character's "subjugation" parameter by 7.5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Outposts of the Golden Sands
 
Book of Twisted Devotion
 
Increases character's "subjugation" parameter by 1 % for every 10 % of the character's "ferocity" parameter.
Type: Passive
Drops from: Outposts every time when the player character has completed 1250 runs
Notes: As the maximum ferocity is 50-52 %, this book can give 5 % of subjugation at maximum.
 
Book of Relentless Force
 
Increases character's "skill power" parameter by 5 % when the character is in combat with three or more enemies.
Type: Passive
Drops from: Towers of the Golden Sands
 
Book of Crushing Force
 
Increases character's "skill power" parameter by 1 % for every 10 % of the character's "penetration" parameter.
Type: Passive
Drops from: Towers every time when the player character has completed 1250 runs
Notes: As the maximum penetration is 50-51.5 %, this book can give 5 % of skill power at maximum.
 
Books from the tribal chests of the Golden Sands of Almahad:
 
Book of Critical Frenzy
 
Increases character's "critical hit strength" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. However, this effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Threatening Humility
 
Increases character's "subjugation" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Book of Irresistible Force
 
Increases character's "skill power" parameter by 5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
Drops from: Tribal Chests of the Golden Sands (Tribal Chest Key is required to open a chest)
 
Other books from Almahad:
 
Book of Controlled Humility
 
Increases character's "subjugation" parameter by 15 %.
Type: Passive
Drops from: Raid boss Demon of the Golden Sands
 
Book of Desert Majesty
 
Increases character's "exhausting heat" parameter by 6 %.
Type: Passive
Drops from: Dune Horrors open-world guild event
 
Book of Desert Haste
 
Increases character's movement speed in the territory of the Golden Sands by 10 %.
Type: Passive
Drops from: Almahad Caches (these can be bought with Miracle Coins)
Notes: This book works only in the territory of Golden Sands and nowhere else.
 
The books of Irselnort
 
Book of Melee Combat Tactics
 
Reduces the damage caused by melee attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Ranged Combat Tactics
 
Reduces the damage caused by ranged attacks to the player character by 5 %.
Type: Passive
Drops from: Raid boss Dungeon Horror
 
Book of Restrained Control
 
The player character will ignore one control effect when the character's health drops below 40 % of the maximum health. This effect has a cooldown of 30 seconds.
Type: Passive
Drops from: Behind Enemy Lines open-world guild event
 
The books from the main seasonal events
 
Books from the Anniversary event:
(These can also be obtained from dungeons during certain seasonal special events)
 
  Book of Enhanced Penetration
 
Increases character's "penetration" parameter by 3 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Beholder (Deadly Stare)
During the Carnival, drops from: The guild event to kill Quibungo (Monstrous Ogre)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Attack Speed
 
Increases character's "attack speed" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Demonologist (Lost Soul)
 
  Book of Enhanced Skill Cooldown
 
Increases character's "skill cooldown" parameter by 7 %.
Type: Passive
During the Anniversary, drops from: The guild event to kill Avenger (Flame of Wrath)
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Enhanced Solidity
 
Increases character's "solidity" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
 
  Book of Enhanced Resistance
 
Increases character's "resistance" parameter by 4 %.
Type: Passive
During the Anniversary, drops from: The GvG guild event associated with Snorlar
During the World Creation, drops from: Mandate of the Winter Runes guild raid (raid reward chest and top-rank showdown reward chest)
 
Books from the Median Night event (Horror Circus):
 
  Book of Enhanced Health Steal
 
Increases character's "health steal" parameter by 6 %.
Type: Passive
During the Median Night, drops from: The raid boss of Horror Circus
During the Median Night, also drops from: The Jester King's Laughter guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Secret Power of Vampirism
 
Increases character's "health steal" parameter by 15 % when the character has less than 20 % of the maximum health left. If the character's health goes above the 20 %, the increase in the "health steal" parameter will stay for 5 seconds.
Type: Passive
During the Median Night, drops from: The Jester King's Laughter guild raid (raid reward chest and top-rank showdown reward chest)
 
  Book of Distortion of Life
 
Restores character's health by 150 % of the damage inflicted by enemies when the character is under the debuff "stunning" with a chance equal to the value of character's "health steal" parameter (maximum health steal is 100 %). The healing effect has a cooldown of 2 seconds.
Type: Passive
During the Median Night, drops from: The open-world guild event of the Horror Circus and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
During the Median Night, also drops from: The Jester King's Laughter guild raid (top-rank showdown reward chest)
Notes: The healing effect of this book does not interact with the Potion of Lifeforce.
 
  Book of Enhanced Stunning
 
Increases character's "stun" parameter by 2.5 %.
Type: Passive
During the Median Night, drops from: The GvG guild event of the Horror Circus
 
  Book of Threatening Sap
 
Increases character's "stun" parameter by 5 % when the character is in combat with three or more enemies.
Type: passive
During the Median Night, drops from: The weekly guild tournament reward chests and the Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
Book of Vampire Might
 
Increases character's "health steal" parameter by 7.5 % for 10 seconds when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: passive
During the Median Night, drops from: Haunted Chests of the Horror Circus (Haunted Chest Key is required to open a chest)
 
  Book of Blood Power
 
Increases character's and all party members' (that are in the same location) "health steal" parameter by 10 % when party's combined health level is less than 50 % of the maximum.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Timed Sap
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 4 % for 7 seconds when two or more members of the party are under any control effect. This effect has a cooldown of 7 seconds.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Shockwave Stun
 
Increases character's and all party members' (that are in the same location) "stun" parameter by 0.5 % for each enemy the party members are in combat with. The maximum increase is 4 %.
Type: Passive
During the Median Night, drops from: Blood Brotherhood Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the World Creation event (Snowy Bound):
 
  Book of Enhanced Rage
 
Increases character's "rage" parameter by 6 %.
Type: Passive
During the World Creation, drops from: The raid boss of Snowy Bound
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (common showdown reward chest and top-rank showdown reward chest)
 
  Book of Rapid Rage
 
Increases character's "attack speed" parameter by 10 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: The open-world guild event of the Snowy Bound and the Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
During the World Creation, also drops from: Mandate of the Winter Runes guild raid (top-rank showdown reward chest)
 
  Book of Enhanced Piercing Attack
 
Increases character's "piercing attack" parameter by 4 %.
Type: Passive
During the World Creation, drops from: The GvG guild event of the Snowy Bound
 
  Book of Enhanced Damage Reflection
 
Increases character's "damage reflection" parameter by 6 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
During the World Creation, drops from: The weekly guild tournament reward chests
 
  Book of Revelation of Rage
 
Applies buff "rage" to the character when the character deals critical damage or critical healing. This effect has a cooldown of 20 seconds.
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Piercing Rage
 
Increases character's "piercing attack" parameter by 6 % when the character is under the buff "rage".
Type: Passive
During the World Creation, drops from: Ice Chests of the Snowy Bound (Ice Chest Key is required to open a chest)
 
  Book of Restrained Rage
 
Applies buff "rage" to the character and all party members (that are in the same location) when two or more members of the party are under any control effect.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: Obviously this book won't work if you are alone.
 
Book of Growing Resistance
 
Increases character's and all party members' (that are in the same location) "resistance" parameter by 1.5 % for every 10 % of the party's total missing health. The maximum increase is 7.5 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 50 % of the maximum.
 
Book of Rising Rage
 
Increases character's and all party members' (that are in the same location) "rage" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 8 %.
Type: Passive
During the World Creation, drops from: Chests of the Ice Order (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Books from the Honoring of the Spring King event (Blissful Isle):
 
  Book of Magical Toughening
 
Increases the numerical value of character's magical defense by 20 % and reduces incoming magical damage from auto attacks to the character by 10 % when the character has less than 30 % of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 5000 event-related reputation
 
  Book of Physical Toughening
 
Increases the numerical value of character's physical defense by 20 % and reduces incoming physical damage from auto attacks to the character by 10 % when the character has less than 30% of health left.
Type: Passive
During the Honoring of the Spring King, drops from: The raid boss of Blissful Isle that becomes available when the player character has earned 15000 event-related reputation
 
  Book of Rampant Attack
 
Increases character's "attack strength" parameter by 10 % when the character is in combat with three or more enemies.
Type: Passive
During the Honoring of the Spring King, drops from: The instanced-area guild event of the Blissful Isle
 
  Book of Enhanced Attack Strength
 
Increases character's "attack strength" parameter by 4 %.
Type: Passive
During the Honoring of the Spring King, drops from: The GvG guild event of the Blissful Isle
During the Honoring of the Spring King, also drops from: Deadly Blossom guild raid (top-rank showdown reward chest)
 
  Book of Combat Agility
 
Increases character's "skill cooldown" parameter by 10 % when the character is in combat with three or more enemies.
Type: passive
During the Honoring of the Spring King, drops from: The weekly guild tournament reward chests
 
Book of Compelled Cooldown
 
Increases character's "skill cooldown" parameter by 3 % for each harmful or control effect the character has. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Deadly Blossom guild raid (raid reward chest and top-rank showdown reward chest)
 
Book of Immense Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 2 % for every 10 % of the party's total missing health. The maximum increase is 12 %.
Type: passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you. The book works at full power when the party's combined health is less than 40 % of the maximum.
 
Book of Deathblow
 
Increases character's and all party members' (that are in the same location) "attack strength" parameter by 1 % for each enemy the party members are in combat with. The maximum increase is 6 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Book of Steadfast Agility
 
Increases character's and all party members' (that are in the same location) "skill cooldown" parameter by 1.5 % for each enemy the party members are in combat with. The maximum increase is 9 %.
Type: Passive
During the Honoring of the Spring King, drops from: Arcane Magisterium Chests (these can be bought with Crimson Corundums) and the event-related Miracle Shop chests
Notes: This book won't work if you are alone. You must have at least one party member in the same location as you.
 
Other books
 
Books from miscellaneous sources:
 
  Book of Enhanced Critical Hit
 
Increases character's "critical hit" parameter by 3 %.
Type: Passive
Drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
 
  Book of Enhanced Accuracy
 
Increases character's "accuracy" parameter by 4 %.
Type: Passive
During the Spring Moon Festival, drops from: The guild event to kill Zhong Kui (Demon Lord)
Also drops from: Horrors of the Deep and Chasing the Wind guild raids (top-rank showdown reward chest)
Notes: This book can also be dropped from dungeons during certain seasonal special events
 
Book of Swiftburst
 
Increases character's movement speed out of combat by 7.5 %.
Type: Passive
During the Spring Moon Festival and Carnival, drops from: Emperor's Sanctum Caches and Dazzling Carnival Caches (these can be bought with Miracle Coins)
 
Books from the non-event competitive guild raids
 
Book of Scaling Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Facilitation
 
Increases character's "facilitation" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Horrors of the Deep guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Book of Scaling Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for every 10 % of the character's missing health. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (raid reward chest and top-rank showdown reward chest)
Notes: The book works at full power when the character has less than 50 % of health left.
 
Book of Burst Tenacity
 
Increases character's "tenacity" parameter by 1.5 % for 10 seconds each time the character uses a skill in combat. The maximum increase is 7.5 %.
Type: Passive
Drops from: Chasing the Wind guild raid (common showdown reward chest and top-rank showdown reward chest)
 
Books from the Activity season reward chests:
 
  Book of Second Chance
 
Resurrects the character's minion once if the minion dies. After the resurrection the minion will receive buff "invulnerability" for 10 seconds.
Type: Passive
Drops from: Activity season reward chests
 
  Book of Underground Speed
 
Increases character's movement speed in any dungeon by 10 %.
Type: Passive
Drops from: Activity season reward chests
 
Books from the Gladiator's Chests:
 
  Book of Gladiator's Ferocity
 
Increases character's "ferocity" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
  Book of Gladiator's Resilience
 
Increases character's "resilience" parameter by 5 % for 30 minutes.
Type: Active
Energy expense: 50 units
Cooldown: 60 seconds
Drops from: Gladiator's Chests (these can be bought with Arena Points)
Notes: This book is personal which means that it can't be given to other players. If you don't need this book, you can sell it to an NPC and receive 10000 gold.
 
 
If you drop one of the passive skill books, you must decide, will you use it, sell it or trade it. It all depends on how much gold you really need. Everyone needs gold but do you feel like you are weak and can never buy any proper equipment due to the lack of gold? If so, then you should sell it as 2.5 % stun or 3 % critical hit chance won't really make you any stronger but good armor and weapon will. If you already have decent gear and you are not in the constant need of gold but your gear isn't +10, then you should think, will the book raise some parameter that you really need or can you even use the book properly? For example, the Book of Rampant Attack might not be the best choice for a druid and the Book of Secret Power of Vampirism might not be the most useful book for a character with 3500 hp. If the book is useful, then you can use it but if it's not, then you could either sell it for gold or trade it for a more suitable book.
 
This is the end of this guide! I hope this will be useful to you.