[thejeff]

Just to clarify, since it seems you might be confused, in a reverse communion you still have 1 master (or a few) and many slaves. It's just that the purpose of the masters is to case path booster spells to raise the slaves' effective levels.
So when you say, "have all 8 enaries casting and my pretender soaking up the fatigue", that implies 8 enarie masters and the pretender as a slave which is not how you want to do it.
In that situation, I'd put all the enaries as slaves, the pretender as master, have him cast PotS, putting each enarie at 2S3D2N. Only those before him will cast. They will also absorb fatigue from anything he casts.
I'd also probably cast LotNS, depending on who you're fighting, and Summon Earthpower to help with everyone's fatigue if your pretender has Earth.