Have your mages memorize as much stoneskin as possible. One for each characters would be ideal. Make sure one can cast Emotion:Hope too. Cast every buffs you have, then summon as much monsters as is possible. If he keep targetting the same character all the time and this character is about to die, just run around with him while the other characters attack the dragon. Memorize as much of the "heal" spell as you can. It completely restore your character, and it,s very fast to cast.
If you really can't beat him, and you have access to that spell, you could cast Delayed blast fireball and spells like that on the altar on which the dragon will appear, that will soften him up before the fight.
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