Higgings's post in Negative accuracy..... was marked as the answer
Precisely! You will have -30% chance to hit the target, thus 30% chance to dodge the attack you'll do. This value sums with the enemy's dodging parameter as well, de facto "increasing" its dodge against you.
Your interpretation is fully correct.
Higgings's post in Need help on battlepass quest was marked as the answer
Demonologist is a raid boss located on a special section, accessible from the location the players call AA, but officially known as Secret Sanctuary.
This is the precise location:
Mind you will need some more people to defeat it.