The Writhing Haunt is an area located in the central part of the Western Plaguelands, just east of the Ruins of Andorhal. Originally the area was a life-sustaining farm, but it has since been overrun by the vile Scourge. In their quest to destroy the living, they have placed a large cauldron in the middle of the field which constantly spews disease-filled vapors into the air. The cauldron itself is protected by Cauldron Lord Razarch, Rotting Ghouls, Freezing Ghouls, and Fetid Zombies. You can find Mulgris Deepriver, a quest giving NPC, hidden inside a house at the Writhing Haunt.