Undead Killing

Graeme Dice said:
Banish still costs the base spellcasting fatigue every time you cast it.

Yeah, but that isn't enough to kill communicants, not unless you exceed a 2:1 ratio. The usual communicant-killers are mages who use the "good" opportunity to cast high-path spells with obscene fatigue costs, not continuous casting of low-fatigue spells.