Get into a room/position where you can set your tanks up front then then launch a pre-emptive attack with spells with missile weapons/spells. You can pick them off peicemeal until they get close, when the tanks/fighters switch to melee and the others keep shooting. You will have to go find the summoners after you have whacked all the preists/everything else. They'll keep summoning stuff. Use cleric defensive spells when it gets close.
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