When a dead body rises again under supernatural powers, what exactly drives its actions?
For intelligent undead creatures like liches, vampires, and death knights, their original souls still control their bodies, classifying them as higher-level undead. On the other hand, for unintelligent undead creatures like skeletons, zombies, and ghouls, their bodies are activated by negative energy and only act on instinct, making them easily controlled by spellcasters and turning them into mindless servants.
However, relying solely on instinct to fight isn't necessarily a bad thing.