Galaxy in Flames

Following his near-fatal encounter with the anathame blade, Warmaster Horus, beloved son of the Emperor, returns to lead the Imperium's greatest legions against the rebellious world of Isstvan III. What begins as a swift, decisive campaign to quash a minor uprising quickly devolves into a cataclysmic act of treachery that reshapes the fate of the galaxy. As Horus's true allegiance is unveiled, a devastating orbital bombardment of virus bombs unleashes untold horrors upon the planet, eradicating billions in a single, horrific act. The loyalist Space Marines trapped on the surface are forced into a desperate, internecine conflict, battling their former brothers who have embraced the Warmaster's dark vision. This pivotal chapter in the Horus Heresy saga lays bare the devastating scale of Horus's betrayal, plunging the nascent Imperium into an era of unprecedented civil war and despair.