Wraith
Wraiths are a variant of ghost found in various myths, religions and assorted /tg/ media. The general difference is that whilst ghosts may be pitiable, wraiths tend to be actively malevolent, or at least so homicidally insane that you really can't spare the time to pity them before they suck out your life with a touch.
For an RPG game in which the player can play a wraith character, see Wraith: The Oblivion