Defining Characteristics of Undead: Animated by Negative Energy
Zombie Template: ++HP, -- AC, -- Speed, Undead Fortitude, Horrible Strength (+ grapple, +damage), unable to use equips
Skeleton Template: +AC, +resist pierce/slash, -speed, able to use equips
Wight Template: ++HP, life drain, +str, +dex, +con, use equips
Ghost Template: + horrible shriek, + horrifying visage, + incorporeal, + life drain,
Ghosts are created when a newly dead spirit "rips" a chunk of their faith-based bubble universe off and uses the energy contained in it as a battery. Most ghosts subsist for some years, then run out of energy and discorporate; those are who are very angry are able to generate more hateful energy and sustain themselves by sucking the energy from those around them.
Bubble Universe = Soul