I'm DMing a game where I want the BBEG to feel almost dreamlike: it can physically do little to nothing, but uses mind control and illusions.
Until now, it mind-controlled the mayor of a small town, hid objects from the players, blinked around a couple times, made a "time freeze illusion": I haven't thought through how powerful these things were because they just looked manageable for a high-level character so I figured they would be balanced.
For my next trick though, I'd like the guy to mind-control a small fortified village, with about 100 people in. Would this be balanced, story-wise?
By "balanced story-wise" I mean that I'm not concerned about the combat balance: I just don't want the players to think "the monster mind-controlled an ENTIRE VILLAGE? It must be too powerful for us to ever fight, we won't ever stand a chance".
By "mind-control 100 people" I mean that the village doesn't have a ruler, but after this spell the whole village sees the bad guy as their ruler: the town guards will protect him if needed, and everyone else just will just be sure that he's their righteous ruler.
I'm asking because I couldn't find a RAW mass mind-control spell, so I don't know how to check whether this would be feasible for a CR 20ish. What I'm looking for is something like "yes, this other monster can do similar things, you're good to go" or "not even a CR 20 monster could mind-control all those people, because Mind Control is a 7th level spell and a mass version would be too powerful".