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Signus Prime

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Signus Prime was the main planet of the Signus Cluster, a tri-star system of seven Hive Worlds and fifteen moons.

Map Basic Data Planetary Image
px Name: Signus Prime px
Segmentum: Ultima Segmentum[1a]
Sector: Unknown
Subsector: Unknown
System: Signus Cluster[1a]
Population: None
Affiliation: Imperium
Class: Morti perpetua[3], Quarantined World
Tithe Grade: Aptus non


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 Worlds, under the rule of Kyriss the Perverse, Greater Daemon of Slaanesh. Kyriss raised for itself a vast palace on Signus Prime, the Cathedral of the Mark, and its daemonic 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 came, ironically, in the form of Sanguinius and the Blood Angels Legion of Space Marines, sent by the Warmaster Horus to what was supposed to be their doom.[1a]

The Battle of Signus Prime

During the Horus Heresy, Signus Prime was the site of an important battle between the Blood Angels and the daemonic armies of Ka'Bandha[1] After the battle, the entire cluster was declared morti perpetua ("forever dead") and quarantined. The Blood Angels expunged all records of their presence on Signus, resettled the few living survivors in neighbouring systems, and deployed beacons to warn starfarers away from the Signus system[2]. They also deployed a tactical cyclonic device to destroy the Cathedral of the Mark and a massive chunk of the continent with it[3].