Around it is centred many significant Imperial planets, including: The main feature of the segmentum is the Eye of Terror. As such, it currently is home to the majority of the Imperium's armed forces, which were most recently mobilised to a state of readiness not seen since the Horus Heresy as a result of the 13th Black Crusade in 999.M41.įollowing the conclusion of the Thirteenth Black Crusade and the resurrection of Roboute Guilliman, much of Segmentum Obscurus has become stranded within Imperium Nihilus. The Segmentum Obscurus is the area of the Imperium most often under deadly threat by attacks from the Eye of Terror and is also the site for all of Abaddon the Despoiler's Black Crusades. The Imperial Navy's Segmentum fleet headquarters is located in the Cypra Mundi System, which also serves as the central headquarters of the Imperial military's Segmentum Command. This Segmentum of the Imperium of Man is the home of the vast permanent Warp Storm and Warp rift called the Eye of Terror, the primary base for the Forces of Chaos in the Milky Way Galaxy.
The Segmentum Obscurus, also known as the Segmentum Obscura, is the region of Imperial space to the galactic north of Terra.
