I generally do it the hard way. Cast all the protective and enhancing spells (like Haste and Bless) I can and then just cut into him.
I keep my weaker characters (thief, mage) back a bit and away from each other, where they attack with missiles and spells. I hit him with everything I have and summon all the critters I can.
I usually lose 1-2 characters, but just resurrect them right back.
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