[Frostmourne27]

I don't usually use communions - I think they're usually more trouble then they're worth - but the few times I have, I'm pretty sure that I've seen slaves acting on their own. In Dom2 at least, I _know_ it happened - I had a bunch of quickened slaves charge the enemy. As far as slaves getting fatigue, they get a proportion equal to 1/# of members of communion, but of the totaly they woud've got if they cast the spell themselves. E.g. Earth wind is cat by an E10 cyclops with a matrix and two slaves with earth 3. the slaves get 1/3 of the base fatigue for bw (40 IIRC) And the cyclops gets 1/3 of the hugely reduced amount an E10 mage gets when casting Blade wind. If the communicants have no/not enough magic (to cast the spell) I assume the progression is reversed. Would make Master Enslave a scary prospect for the communicant, if its possible to get more than 200 fatigue from a communion masters spell. Fatigue from spell mages cast is capped at 200. Is that true for other members of a communion casting spells too? IDK, but I sort of think its also capped.

As to being a slave AND a master, astral mages with bad/unusual research and no scripts sometimes cast both, which might indicate it working, but they also sometimes use communions in the arena, so they might just be being stupid.