Thanks for the quick reply.
Yes, he is level 38.
My knight doesn't seem to hit him that much, nor do my summons, and none of my spells really do that much damage. His metor shower spell can kill me instantly so I've been keeping stunned with my hammer attack. I don't care if I can beat the last battle or not. I just want to get to it, I can wait for the BF fix to deal with that one.

Also, all those shadow creatures are killed instantly when I use my hammer spell, so they aren't a problem.

Any idea what spell would do the most damage?