One of the Leadership powers, I believe it is Assault, has a resistance to placate and taunt. I don't know of any other powers that do this.
I doubt any enemies have it. But level differences will probably reduce the placate duration.
Resistance is not immunity. It means that the effect lasts for less time, so even with very high resistance a placte then an immediate (fast) attack should still get a critical.
@Unthing ... Mostly on Union.
While doing my homework for my new Mastermind I noticed that Mercenary pets apparently have resistance to Placate. Does anyone know if any enemies have this, or if any player powers now include it?
"If there's anything worse than being sacrificed, it's being sacrificed incompetantly."