The Yasan Sector is a Sector of Imperial space that contains the White Scars Chapter's Homeworld, Chogoris. The world was occupied by both followers of Horus and Dark Eldar raiders during the chaos of the Horus Heresy. During the Great Scouring, the White Scars battled both the traitors and Dark Eldar to liberate the Sector. In one such battle, Jaghatai Khan was thought lost within the Webway.
In the wake of the Great Rift's creation, the Sector is now infested by the Red Corsairs and the Gartuli and Thaxis Systems have fallen to them. While the White Scars have scoured most of the Red Corsairs forces from their Homeworld, much of the Chogoris System is still afflicted by the Traitors.
- 1: Codex: Space Marines (8th Edition), pg. 34
- 2: Codex Supplement: White Scars (8th Edition), pgs. 8-9 - Chogoris