|Segmentum=[[Ultima Segmentum]]{{CFn|1a}}

|System=Signus Cluster{{CFn|1a}}

'''Signus Prime''' is the main planet of the Signus Cluster, a tri-star system of seven [[Hive World]]s and fifteen moons. Once a major industrial center, the System of Signus fell prey to the agents of [[Chaos]] during the dark days of the [[Horus Heresy]]. It became a [[Realm of Chaos]], a system of [[Daemon World]]s, and fell under the rule of Kyriss the Perverse, [[Greater Daemon]] of [[Slaanesh]]. Kyriss raised for itself a vast palace on Signus Prime, and its [[daemon]]ic horde rampaged across the system, utterly destroying hundreds of years of civilization and annihilating several planets. The entire populace was either butchered, enslaved, or corrupted, and all hope fled its inhabitants. Deliverance was to come, ironically, in the form of [[Sanguinius]] and the [[Blood Angels|Blood Angels Legion of Space Marines]], sent by the [[Horus|Warmaster Horus]] to what was supposed to be their doom.{{CFn|1a}}

*{{CEndn|1}}: [[Horus Heresy (Artbook Series)|Horus Heresy: Collected Visions:]] Volume II: Visions of Darkness**{{CEndn|1a}}: Pages pgs. 171-2172**{{CEndn|1b}}: Pages pgs. 176-7177===Uncited===*{{C|2}}: [[Horus Heresy (Artbook Series)|Horus Heresy: Collected Visions:]] Volume IV: Visions of Death: Pages , pgs. 340-1341*{{C|3}} [http://www.blacklibrary.com/Blog/Where-angels-fear.html Black Library] ''Acessed (last accessed 8/1/2012'')