Undead - I

Ignorant Ghost = The Ignorant Ghost is not even aware that they are dead. These Ghosts, when they manifest, will effectively be suffering from amnesia and still believe themselves to be mortals. These Ghosts present a unique challenge to Resurrectionists - how does one break the news to an Ignorant Ghost that they are dead? 
(True) Immortals = True Immortals are both immortal and revenants who are raised by holy power. They run on Kenosis too.
Incapacitating Death = In theory if you could incapacitate Death, that would result in an unnatural world. Death, for all of its horror and mystery, is a part of the natural order and serves a purpose. 
Indian Ghost Warrior = A common spectre in the Americas, the Indian Ghost Warrior is the supposed to be the spirit of a long-dead Native American warrior. They fight using primitive but traditional weapons and they frequently possess shapeshifting abilities.