A Possesion Wraith is a kind of spirit that takes over a human's body, such as the Syren. Once a victim is possessed they will be stuck with the wraith until it finds a new inhabitant. If you are possessed you can only fall asleep at the Wraith's Dwelling Place or else you will die. Some older ghosts look exactly like Possesion Wraiths. In fact, the only difference is when they move. A ghost will keep its form, but a Wraith will not. For example, the Syren turns into a blue tornado while moving.