Revenant

The entire village stood out in the cold autumnal rain, around the open grave. On the muddy ground at their feet lay the body of a beautiful young woman. Her pale face was dotted with rain drops and blood. The shroud drawn up over most of her body did little to hide the terrible wounds she had suffered, or the fact that her head had been cut from her body.

"In traumatic instances, at the moment of death as the soul flees the body, sometimes something else takes it's place." Brother Maynard absently adjusted his grip on the bloody short sword as he cleared his throat. "It seems as if our loved one has survived, but.. but in truth an evil spirit, greedy and selfish, has taken her place. In such cases there is little that can be done."

The rain did nothing to disguise the tear streaked faces of the villagers. Brother Maynard wiped his face with his free hand, smearing a bit of blood across his cheek. "We will always remember her for the person she was, not for the creature that tried to take the memory of the woman we loved and defile it with it's heinous acts. It was a parasite, and we will not grant it any more thought than it deserves. Let us instead grieve our loss, consign this empty shell to the earth, and be thankful for the time we had together."

Revenant
Armor Class: 4
Hit Dice: 4+1** (M)
Move: 90' (30')
Attacks: 2 claws/ 1 special
Damage: 1d6/1d6/special
No. Appearing: 1 (1)
Save As: C6
Morale: 12
Treasure Type: B
Intelligence: 4
Alignment: Chaotic
XP Value: 375

Type: Undead (rare)
These corporeal undead appear much as they did in life, but as time passes, their eyes become as black as their hearts. Because they retain all the memories of the host body's life, they're very difficult to discover initially. Only as time passes, and the new personality emerges is the truth revealed... but only for those that can overcome their intrinsic Charm Person ability, which they can employ every round, in addition to whatever other attacks they make. Those that make their save against the charm effect must then save against the horror of realizing what the creature is (as a Fear spell).

Revenants are solitary undead, but will use their charmed victims without care. As undead they are immune to sleep, charm, and hold spells, and can only be harmed by silver or magic weapons. They are turned as mummies.

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While the RC already has a Revenant, it's an 18HD Spirit. This is a lower level version just in time for Halloween.