Well I dont know how amazing your armor is, but since you get owned, it doesnt seem amazing anymore
The time I face is is at bout level 27 or 28, which able to take him down in 1st try. I find the human mini boss in the same cave is more troublesome over baal, as he has freaking lots of archers which stuns me often and render my char useless.
Anyway back to baal, I just pull all his minions in the room before the room locked up and get rid of them easily 1 by 1. Then face him directly and slowly raped him down, pretty easy. Baal will give you the best weapon in game, which come with 3 enchantment slots.
