The best way to win without doing anything cheesy is to bash him to death once his protection spells wear off. To live long enough to do that, you need to be fairly high level, and also conjure as many monsters and beasties as you can. Keep your party in the back while you use "animate dead" and "monster summoning" to make as much fodder as possible. Potions of speed always help, but expect to use a few raise demons, especially if some nasty critters are summoned.
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