Ghost

Background
Ghosts often appear after a violent death or here for some unfinished business they never get to do in their past life, in various episodes ghosts are shown with violent and territorial tendecies, they also can be summoned to do harm onto others at which most times backfire and the ghosts turn on their masters. They can have various abilities depending on the enviroment they died from. they can be repeled by salt in order to permanentally is to salt and burn their remains or any thing that it connected to them. However if the remains are cremated it is often that the burned remains to be salted to prevent future hauntings.

Powers
the ghosts in the show do have the basic invulnerability to physical attacks from mortals and can not be harmed easily, they can be despersed by shells with sacred metals, herbs the works it temporarally incapacitates them but ghosts have that nasty tendency of reforming back into their original forms(simply due to the fact that they have ectoplasmic structures). They also have the ability to teleport from one location to another as well as the standard phazing into walls and other physical barriers unless if the door way and the walls have been salted.