[MaxWilson]

Gifts From Heaven is not mundane, but yes, Fog Warriors will prevent the first one from doing more than 1 point of damage, and with its low Prec it may not hit twice. I've got to second the idea of attacking the communion mages, especially during the magic phase (Cloud Trapeze + Mistform + Rain of Stones). Even if you can't do that, communions tend not to be very strategically mobile (more like an anvil than a hammer) and you should potentially be able to raid around them.

Rigor Mortis is also good against communions because it usually prevents any non-reinvig'ed mage from ever coming back online once he's gone unconscious. The masters will go unconscious (from encumbrance if nothing else) and hopefully the slaves will die of fatigue. Actually if you can just get a few good thugs in there the communion may start popping off its own slaves from fatigue damage if you hang in there long enough; it depends upon how smart he is about master/slave ratios.

-Max

P.S. I bet raise dead spam would work too. Communions, like banishing priests, prefer to target for a lot of HP damage. A sufficient number of death mages raising dead should keep the masters casting until the slaves pop, just like thugs would. The problem here is that an army of necromancers is not any more strategically nimble than a communion is.