The Dead Lands of Athas
Over 3000 years ago, a cataclysmic event occurred in a region once known as the Ulyan Basin, where an accident of unknown origins opens a gate to the Gray, and molten obsidian flows across the land for hundreds of miles in each direction until the gate was closed. Hundreds of thousands die in the disaster, later referred to as “the Obsidian Tide.”
The liquid obsidian was imbued with negative energy from the Gray, and those killed by the Obsidian Tide rise as undead creatures. The Dead Lands are born.
Many of the The Warbringer’s servants who perished here have arisen as rulers of this land, becoming powerful Undead Lords. Gretch, one of the Warbringer’s chief researchers appointed to look to the Gray as a potential source of arcane power, was one of the most powerful of these Undead Lords.