Geist

Sin-Eaters, also known as the Bound, are mortals who have died, but made what is referred to as the Bargain with strange, alien spirits called Geists to return to life. This does not come without a price; they must share their body, mind, and desires with the Geist, and often spend as much time confronting the death around them as well as appeasing their new "friend" as they try to continue their own life.