Weak
Fetid Corpse: Long rotted corpse containing the soul of a wicked human. Very slow.
Ghost: Can't hurt you, but can play tricks that may put you in a dangerous situation.

Moderate
Shadow: Ghost whose hated caused it to gain a physical, shadow like form. It's fingers are razor sharp.
Zombie: Less decayed then Fetid corpses, and therefore more powerful.
Skeleton: Zombie that has lost all its flesh. It can move quickly, but can't do as much damage as a zombie can.