Wights
Wights are undead. Undead are once-living creatures animated by spiritual or supernatural forces. They have darkvision. Undead have immunity to all mind-affecting effects (charms, compulsions, morale effects, patterns, and phantasms). They have immunity to bleed, death effects, disease, paralysis, poison, sleep effects, and stunning. Undead are not subject to nonlethal damage, ability drain, or energy drain. They are immune to damage to their physical ability scores, as well as to exhaustion and fatigue effects. They cannot heal damage on their own if they are unintelligent, although they can be healed. Negative energy (such as an inflict spell) can heal undead creatures. They may have fast healing regardless of the creature’s intelligence. They have immunity to any effect that requires a Fortitude save (unless the effect also works on objects or is harmless). Undead are not at risk of death from massive damage, but are immediately destroyed when reduced to 0 hit points.