I foddered them (summoned critters at them) myself until they ran out of their spells, then ran in and whacked both of them. Having several disruption spells helps. OK, you seem to be cleric-light in your party, so if you have them, use Spell Thrust, Breach, Hidden Word, etc. against the mages. If you have a Cloudkill wand, use it against them as it may affect spellcasting as well. Also, if Aerie has it, use Miscast Magic on one of the mages before charging in. It was fairly easy to take them out using my strategy...hope this helps!
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