|Map||Basic Data||Planetary Image|
|Sector:||Eye of Terror|
Using slaves captured from campaigns against the Imperium, the Legion was able to build a massive fortress named Monument on the planet and entombed the corpse of Horus within it. However during the Eye of Terror Slave Wars, the Emperors Children launched a devastating surprise assault on Maeleum, ruining the Sons of Horus' Fortress and stealing Horus' corpse. It was at this time that Abaddon returned to lead his forces to recover Horus' corpse, and the newly-named Black Legion abandoned the ruins of Maeleum.
- 1: Black Legion - A Codex: Chaos Space Marines Supplement (E-Book) pgs. 13-18
- 2: Extinction (Short Story), by Aaron Dembski-Bowden
- 3: Black Legion (Novel) Chapter 3