I killed him of very easy, I was a paladin with the +5 sword, can't remember the name. Anyway, I got a protection from magic spell and Aerie casted it on me. Now I had a globe around me, I put the entire group on the other side of the room and went ahead with my paladin, he didn't do 1 hitpoint damage on me, I just stood there and hacked away at him while he was casting his spells on me