A wraith is a form of incorporeal undead. Unlike ghosts, wraiths remained in the world of the living intentionally through the use of Soul Magic or sheer force of will. It can be difficult to avoid passing beyond the Veil and into the Ether to be reborn, so wraiths tend to grow stronger with Soul Magic in order to counter this effect as time goes on.
By necessity, wraiths tend to learn telekinesis quickly if they did not already know it at the time they died, in order to be capable of interacting much with the world at all. Due to their knowledge of Soul Magic, they can be difficult to exorcise.