Yeah, personally a lot of the Arx quests are really tedious for me. The Demon is too tanky, I don't know how you killed them. They wiped my group by spamming epidemic of fire every single turn the second time I fought them, and it took almost 30 turns (full rotations) for me to clip through their armor, and get into a position that I could kill them, until I cc'd them, and found out that they regenerate 30% of their armor whenever they are cc'd.
