Game Mechanics: Rapture/Dictate Immunity

[Treats]

If the mob cannot be slowed, you probably cannot Dictate/Rapture it either.

If the mob was ever immune to stun (Giants in Velious/55+ mobs etc) you probably shouldn't be able to Rapture either. Rapture is just a 24 second stun. I don't know when this immunity was put in place though.

Specifically looking at Unslowable mobs back in the Classic/Kunark/Velious should tell you exactly what could and could not be Dicate/Raptured because the NPC's magic resistance was just so high.