Undead

Undead are once-living creatures animated by spiritual or supernatural forces. They have darkvision. They are immune to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects). They are immune to poison, sleep effects, paralysis, stunning, disease, and death effects.

They are not subject to critical hits, nonlethal damage, ability drain, or energy drain. They are immune to damage to their physical ability scores (Strength, Dexterity, and Constitution), as well as to fatigue and exhaustion effects. They cannot heal damage on their own if they are mindless, although they can be healed. Negative energy (such as an inflict spell) can heal undead creatures. The fast healing special quality works even if they are mindless.