Sonnegeist is a large desert of dragon-blasted glass in Ostrus.
Sonnegeist is a vast, desolate wasteland. Thousands of years ago, the desert known as Sonnegeist was the heart of the great Kasrin Empire. It was a green, fertile land, dotted with advanced cities. Following the Kasrin Civil War and the Great Scorching, the land was reduced to an inhospitable desert riddled with charred ruins and haunted by undead.
Sonnegeist presents many dangers: unforgiving sun, deadly predators, and shardstorms (sandstorms of black, glassy sand). Despite this, its many ruins entice adventurers with treasure and artifacts.