Changes

'''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.{{Fn|1}}