Ogrork the Mighty
Explorer
Probably comes from zombies/skeletons being thought of as mindless archetypes of undead, and then applied to undead in general.
The undead race in WoW also has a racial power related to strength of will.If I ever DM D&D again, I am going to try to houserule that intelligent undead get Iron Will as a bonus feat but may be affected by mind-affecting effects. My inspiration would be the Kindred of the World of Darkness. The vampires in WoD can be controlled by the domination gaze of more powerful vampires.
This is the answer.
Mindless undead do not think. They have no conscience. They don't make choices. They are deterministic creatures. They have only animation.
Work force doesn't have much animation.So then I don't get it. What makes them different from the rest of the work force?
That makes sense too, but for some reason I just can't see undead getting hypnotized by a color spray or fascinated by a bard's song. Sure, under special circumstances, like a bard who has power over the undead, but in general? Nah. As for the vampire example you cited... that could just as well be a necromantic effect applicable to vampires only. YMMV.There is no good reason why intelligent undead should be immune to mind-affecting effects. They have minds.
Unintelligent undead do not have Int scores, so they should be immune to mind-affecting effects, just like all creatures that lack Int scores.
As far as design reasons go, I would say the designers may have wanted only negative energy effects to be able to control the actions of undead.
I don't like it because it helps to nerf an entire school of magic.
That makes sense too, but for some reason I just can't see undead getting hypnotized by a color spray or fascinated by a bard's song. Sure, under special circumstances, like a bard who has power over the undead, but in general? Nah. As for the vampire example you cited... that could just as well be a necromantic effect applicable to vampires only. YMMV.