Corpse Wraiths (TSASA)

Also known as revenants, ghosts, onryōs, or restless spirits, Corpse Wraiths are supernaturally reanimated semi-corporeal corpses inhabited by the spirit of the deceased. They are notorious undead being whom presence disrupt the balance of nature and is featured in The Steampunk Adventures of Sorcerer's Apprentices. Due to dangers they pose to the land of the living, CrossMages formed Ghost Security Service to deal hauntings that they caused.

Description
A dying person whom in the state of rage and/or extreme obsession to finish his/her business in life would likely rises as corpse wraiths. Their said feelings during their demise was so strong that they refuse to cross over to afterlife and returned to their decayed husks. Unfortunately, union between this restless spirit and their decayed husk resulting an unholy resuscitation as they rises as half-corpse, half-spectral entity called corpse wraith.

Corpse wraiths' appearance vary between one and another depend on what they looked like in life and how they died, but they commonly depicted as reanimated decaying corpses with bodies imbued with ectoplasm. It was clarified that their zombie-like appearance was due to corpse wraiths rises few days after their mortal demise. Weaker corpse wraiths have bodies that decayed so much that it barely put back together by their spirit. Stronger corpse wraiths such as Nefarian Crane however, can restore their bodies that they can access their mortal appearance to blend in the land of the living.

Also, due to their unholy resurrection as half-spectral being, corpse wraith now capable to phasing completely into bodies of the living to possess them as well as phase through solid object. Their unholy resurrection also caused their physical form constantly emit ectoplasm and even bleeds the same substance when harmed. Because they are already dead and meant to be that way, corpse phantoms cannot be killed by conventional means.

Countermeasures
Due to their unholy nature, corpse wraiths are frightenened or faltered by presence of sacred objects such as cross or other religious-related objects. For the same reason, salts can harm and even incapacitated a corpse wraiths than any known mundane weapons. The only way to put these abberations back to rest is by salting their bodies before burning them.