wormxwood

It works in DF single player, but multiplayer I get errors.

Of course it's stupid, it's not even really a question. In close quarters like a 5x3 room, or low framerates, the projectile will hit you before you can even observe it exists. The incubus also prioritizes firing that insta-kill off every time the cooldown is gone over moving to and engaging the player in melee - so if it gets into or near melee range of you and the cooldown is up, it will instant kill you with an unavoidable ranged attack from 2 feet away. Just change DFhandDemonIncubus in Items.xml Damage Entity value to something reasonable like 50-150 depending on your progression, instead of 250 damage. Line 37572.