The answer my friend is to blind the son of a &$*(%. You can do this with the blind spell,
or if you don't have that spell you can use a flask. Yes, blind him, then kill him. Now if
you really want to stack the deck, head in there with a blind flask/spell and a bunch of
damaging flasks or spell books. Blind him, then hit him with everything you have. Maybe a
poison, the a fire book, then an ice book etc...

my character was lv 8+ in all classes before i fought him. i had
45 str
24 int
26 res
36 vit
25 spd
15 dex
8 lck

fighter was 15
thief was 12
mage was 7
priest was 8

gice ur charector 6 cure flasks and then keep on hitting and dodging and using cure then
eventually he will die. thats wat did.