Sebastus IV was an Imperial world later claimed by the Iron Warriors in the aftermath of the Horus Heresy. It was here that Primarch Perturabo built the Eternal Fortress, which ensnared the Imperial Fists into a bloody battle known as the Iron Cage. The Imperial Fists, with the aid of the Ultramarines, eventually reclaimed the planet.
|Map||Basic Data||Planetary Image|
|Affiliation:||Imperium, former — Chaos (Iron Warriors)|