Some ideas
Spirit
Summons monster that has % of dmg,defs and hp of necromancer
1/4 could be 25% of necro attributes, it would last 10 sec
2/4 could be 50% of necro attributes, would last 15 sec
3/4 could be 75% of necro attributes, would last 20 sec
4/4 could be 100% of necro attributes,would last 30 sec
It wouldnt follow necro but attack nearest hostile mob/enemy.
Cd would be 1 min
Spirit of Vengeance
Summons monster that deals % of necro mdmg every x second and when killed/time ends would do 10% of enemy max hp as dmg
1/4 deals 5% of necro mdmg every 5 sec and lasts 10 sec
2/4 deals 7.5% of necro mdmg every 5 sec and lasts 10 sec
3/4 deals 10% of necro mdmg every 5 sec and lasts 10 sec
4/4 deals 10% of necro dmg every 5 sec and lasts 15 sec
Cd could be 1-2min for all levels
Call for help
Summons 1 random party member from same area that necro is in to necro and give them defense buff
1/4 would give 10% buff to both defenses
2/4 would give 20% buff
3/4 would give 30% buff
4/4 would give 40% buff
I have more skill ideas but theyre not summon skills anymore