Karkaron, the Avenger

Karkaron was once a half-orc Paladin of the Most Solemn Order of the Silent Shroud. Most of his order were gravediggers and embalmers, who would pass on information about potential undead sightings and descrations. Some, however, were warriors, who would act on these reports, slaying undead in the name of Kelemvor, the Lord of the Dead.

Karkaron's order has long been disbanded, replaced by others. Karkaron himself died more than a century ago, on an expedition headed west. However, his fervor and fury at being unable to complete his mission attracted the attention of a powerful fiend, who made a deal with Karkaron to resurrect him: as an undead wight. The resulting transformation irrevocably damaged his psyche, and upon waking, he found himself buried underground, with several others of his order, to keep any vile necromancers from enacting a post-mortem revenge.

Unable to escape his crypt, Karkaron raged and raved for decades, until recently. The same tremors that cracked the earth and unveiled a passage to the Underdark, opened a path for Karkaron and his now undead comrades to plague the surface. His goal: to create an army of undead so powerful, they would be able to kill any undead who dared to rise.

Post-Crackening
Karkaron and his undead rabble were defeated by a group of adventurers from the Outpost. However, Karkaron's spirit refused to leave the Prime Material Plane with his life goal incomplete. Through a combination of sheer hatred and force of will, Karkaron coalesced his spirit into a being known as a revenant. He had two goals now: the destruction of any who would pervert the natural order of life and death, and the death of the tiefling who killed him, Damerus.

Post-Damarus
Since Damarus died at the hand of the sea hags, Karkaron died with him.