[Baalz]

Well, the big impact that this change would have is the reverse communion, and depending on how such a fix is implemented it could still preserve the same strategic depth of the communion. The reverse communion is conceptually like buffing thugs, only you're buffing the slaves for casting using summon earthpower, power of the spheres, etc. Seems thematically consistent if the intent is that the slaves can be buffed. Dunno if the code might make such a check difficult, but ideally the fix would make it so that slaves can't cast if any master casts a spell that turn regardless of sequence - but can cast if no master is casting for that turn. That way you could deploy the communion, the masters cast buffs and are then scripted to a non casting order while the slaves take over. To me at least this seems thematic, balanced, intuitive, and consistent while leaving in the depth.

Also, KO I wanted to point out that in the current state slaves are unable to take any action at all after a master casts, including non-casting actions. In the case of buffing slaves for melee it's necessary to retreat the masters or give them bow and script them to fire or something similar. This is different than what you mention, just wanted to bring it up if you ever do take a look at this.