The edimmu were envisioned in Sumerian religion as the ghosts of those who were not buried properly. They were considered vengeful toward the living and might possess people if they did not respect certain taboos. They were thought to cause disease in the living. The edimmu were also thought to be "wind" spirits that sucked the life out of the susceptible and the sleeping.
An ekimmu is an angry undead spirit that hates humans, demihumans and humanoids, and seeks vengeance against the living.