Undead

"Once an area is infested with undead, it becomes a gathering place for the foul things." -Genma Björndotr
Undead were once-living creatures that have been animated by spiritual or supernatural forces.
Undead are extremely resilient to a number of effects and substances that are extremely harmful to the living. They are immune to all mind-affecting effects, poison, sleep effects, paralysis, stunning, disease, and necrotic effects. In addition, it is not possible to drain their life force in any manner.