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The most Important thing is to hit him with magic that is Opposite of whatever form he has taken. use cold magic when he is in fire form, use fire magic when he is in ice form, etc... have your fighters attack and take punishment while mages and clerics cast spells. Magic items are also helpful, potions of firebreath, wand of frost, etc. keep up the damage because he heals himself.
Note: There are ways to hurt him when he is in slime and air form, but I don't remember what they are.
Good luck
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