Kyuss

Kyuss is a demigod of the undead in the Dungeons & Dragons Greyhawk setting, and also a 80's stoner rock band that went on to be the Queens of the Stone Age. He's also known as the Worm-master and The Worm That Walks. He likes worms.

Kyuss's faithful believe that life is obscene, death offers only nothingness and that undeath is the only worthwhile goal. Followers of Kyuss are committed to creating undead wherever they can; whilst they are permitted to control them if necessary, they are encouraged to set their creations free when they have no further use for them. Undead are sacred to Kyuss, and his followers are forbidden from destroying them except in self-defense.

Kyuss was a priest of Nerull who sacrificed every last one of his unsuspecting friends, family and followers in a spectacular and wormy ritual to please his patron god. Unfortunately for Cleric Kyuss, his reward for having himself and everyone he knew consumed alive by flesh boring maggots was being bound into a stone obelisk and abandoned at the bottom of a deep, dark worm-filled fissure (just as planned), because it turns out evil gods don't like having their authority challenged by their clergy. The inconvenience of all this hasn't stopped Kyuss getting Dracolich and vampire silver dragon followers, fashioning whole new types of wormy undead to fill out monster manuals, and creating the Ebon Triad as a front for his cult- pissing off almost every evil god of significance in the Pathfinder pantheon.

Kyuss is mostly famous for the Sons of Kyuss, a monster from the first edition Fiend folio. They are walking, worm-filled undead, that attempt to burrow into living things. He appears in the 3e book Elder Evils, where he stands on the cover and appears as one of the nine Evils inside. In the adventure a cultist is trying to free Kyuss by touching his prison with a Sphere of Annihilation. Said cultist pilfered this Sphere from the Tomb of Horrors.