Sotha was a far-flung world close to the edge of the galaxy's Eastern Fringe discovered during the Great Crusade in 882.M30 by the Imperial Expeditionary Fleets of the Ultramarines Legion. Sotha would later serve as the Chapter homeworld of the Scythes of the Emperor, a Loyalist Space Marine Chapter, a Successor Chapter of the Ultramarines. The Scythes of the Emperor, along with their allies, the Lamenters Chapter, were virtually destroyed during the invasion of the Imperium of Man by the Tyranids' Hive Fleet Kraken in 992.M41.