The Rueckenberge is a large mountain range in the Kreisens. Its peaks are extremely rugged, and there are no known passes through the range, so it effectively divides the Kreisens into a northern half and a southern half. Even the magic and engineering skills of the Old Empire could never find a route.
Myths and legends suggest at many hidden aspects of the Rueckenberge. These are supported by the presence of more nuraghe than most places in Eard as well as remnants of Old Imperial scholarship.