After seven years of bitter war, the end has come. Terra lies within the Warmaster’s sights, the Throneworld and the seat of his father’s rule. Horus has become the ascendant vessel of Chaos and amassed a terrible army to enact his vengeance. But the way to the Throne will be hard as the primarch Rogal Dorn marshals the defences. To gain even a foothold on Terran soil, Horus must challenge the might of the Sol System and the many fleets and bulwarks arrayed there. Thus the greatest conflict in the history of mankind begins.