Something you should note as you play with Communion, *sometimes* the Slaves wills it around and do nothing (Which is good) but if the Communion Slave spell doesn't fatigue them above 100+ Fatigue and they have the ability to cast a spell slaves will cast it. It's often a good idea with Commumion/Sabbath slaves to place "hold x5," orders so they don't prematurely fatigue themselves, then kill themselves because the masters cast the big spells. When using 3+ masters you can kill your slaves quite easily as the battle progresses if they don't manage their fatigue (Communion Masters have no problem casting high fatigue spells that will kill slaves, they have no remorse