Defacer (CR 6)

Medium Undead
Alignment: Always neutral evil
Initiative: +2(Dex); Senses: darkvision 60 ft., tremorsense 60 ft., Listen +15, and Spot +15
Languages: understands creator's orders

AC: 19 (+2 Dex, +7 natural), touch 12, flat-footed 17; Dodge, Mobility
Hit Dice: 11d12 (71 hp); DR: 10/silver
Fort +3, Ref +5, Will +8
Speed: 30 ft.; Spring Attack, earth glide
Space: 5 ft., Reach 5 ft.
Base Attack +5; Grapple +9
Attack: Melee: 2 slams +10 each (1d8+4 plus stunning possession)
Special Attacks/Actions: steal face
Attack Options: stunning possession
Abilities: Str 18, Dex 15, Con -, Int 7, Wis 13, Cha 14
Special Abilities: Aura: frightful keening (60 ft.); Immune: undead immunities
Special Qualities: undead traits
Feats: Dodge, Mobility, Spring Attack, Weapon Focus (slam),
Skills: Listen +15 and Spot +15
Climate/Terrain: Any
Organization: None
Treasure/Possessions: None

Source: Monster Manual IV

Frightful Keening (Su): The faces that whirl about the head of a defacer constantly wail and scream. This noise can be heard through earth and stone as easily as it can through air. A defacer cannot stop this keening. Any creature that can hear the sound and that is within 60 feet of a defacer is automatically shaken. This is a sonic, mind-affecting fear effect.

Earth Glide (Ex): A defacer glides through stone, dirt, and any other sort of earth except metal as easily as a fish swims through water. Its burrowing leaves behind no tunnel or hole, nor does it create a ripple or any other signs of its presence (although its frightful keening can still be heard).

Stunning Possession (Su): A creature with an Intelligence of 3 or higher that is struck by a defacer's slam attack must succeed on a DC 17 Will save or be stunned for 1 round. The save DC is Charisma-based.

While stunned, the creature's face takes on the shape of one of the defacer's victims and screams for help and release using the languages that soul knew in life. When the effect ends, the ghostly face returns to the defacer.

Steal Face (Su): If a defacer's slam attack kills a creature with an Intelligence of 3 or higher, or if the defacer touches the body of such a creature within 1 day of its death, the defacer steals its face as an immediate action. This physically erases the facial features of the body, including bone structure, mouth, and teeth, leaving a smooth and blank surface. Attempts to cast speak with dead on victims of this attack always fail.

This defilement of the corpse also draws the soul of the creature to the defacer, and it becomes one of the keening faces that whirl about the defacer's head. This prevents the soul from reaching the afterlife, becoming undead, or being raised or resurrected. Nothing short of destroying the defacer restores a corpse's face and frees the soul.

For 1 day after stealing a face, the defacer's blank visage takes the shape of that creature's face in the same manner as a creature affected by its stunning possession. This effect ends if the defacer uses its earth glide ability, which it is loath to do unless it thinks it can take another creature's face that day.

If a defacer stole a creature's face by killing it and is destroyed within 24 hours of that act, its victim returns to life (stable at 0 hit points) if its body is largely whole. Its face is restored. This return to life does not result in level loss or ability drain.

A defacer arises when a spellcaster creates an undead being from the corpse of a doppelganger or other creature that assumes others' visages. Tortured by its inability to mimic others, a defacer steals the faces of those it kills and of the recently dead, trapping their souls by defiling their corpses.