U Is for Unflagging
unflagging: (adj.) tireless; persistent
A revenant rises from the grave to destroy its killers. It appears somewhat as it did in life, but decayed and with pallid skin, cold and clammy, tight against its bones. Its sunken eyes blaze with fevered hatred, and an aura of sadness, anger, and determination hangs about it. No matter how decayed a revenant might be, its killers can always recognize it for who it was. A revenant is an intelligent, cunning, and implacable foe.
When it finds its killers, the revenant attacks, using its claw-like hands with deadly effect. If a single claw’s attack roll is 5 or more better than needed to hit its target, the revenant’s steely grip clamps shut on the victim’s throat. The revenant then strangles the victim, automatically inflicting claw damage each round. Any living creature that meets the revenant’s gaze must make a saving throw or being paralyzed by fear for 2d4 rounds.
Until it has claimed its revenge against its killers, a revenant proves difficult to stop. It regenerates 3 hit points of damage per round, except for damage inflicted by fire. It is immune to acid and to attacks that otherwise cannot affect the undead, such as charms, poison, et cetera.
A revenant’s severed parts continue to act, as if controlled by the revenant’s mind. Even complete dismemberment cannot destroy a revenant. It must be killed with fire, or else it will recover from any damage eventually and resume its hunt for its killers. A revenant is undead, but it is motivated entirely by a single-minded desire for vengeance. As a result, holy water, holy symbols, and the like do not affect a revenant. It cannot be turned by a cleric.
A revenant always has as many Hit Dice as it did in life. Furthermore, it usually retains whatever abilities it possessed in life.
Revenant
Hit Dice: As original creature
Armor Class: As original creature
Attacks: 2 claws (1d8)
Special: Gaze causes paralysis, immune to acid, immune to sleep and charm spells, regenerates, strangulation
Move: As original creature
Saving Throw: As original creature
Alignment: Neutrality
Number Encountered: 1
Challenge Level: As original creature +4