[Taqwus]

Regarding reinvig, Summon Earthpower, IIRC, is the only spell which provides constant reinvigoration. There are one-shot spells which reduce fatigue, such as Relief (which affects all friendlies, including communicants, to some degree) and Leeching Touch / Leech / Drain Life. It wouldn't surprise me too much if the draining spells went through a separate code path and didn't affect the communicants, but if it did...


Oh, and yes those chain-exploding Phoenix Pyre'd communicants can be quite a sight to behold. Especially if it was the spell-casting AI that chose Phoenix Pyre instead of it being listed in a script.


On weirdness involving communion, it might be noteworthy that at least one stock nation gets not-terribly-expensive -stealthy- astral mages -- the Star Children of R'lyeh, available at any underwater or coastal fort. They don't get other magic, however, which limits what they can do (although a stealthy Communion + Doom + Vortex of Returning might be irritating).