Raised by a world steeped in political games and the struggle for power, Perturabo was always an oddity for the people of Olympia—truly, his philosophical and scientific inquiries knew no equal. But after meeting the Emperor came decades of thankless campaigns of the Great Crusade, and within the primarch’s heart grew dissatisfaction with the place allotted to his legion within the Imperium. And when news reaches him about unrest on the planet that became his home, the Iron Lord orders his warriors to abandon the fight against the alien Khruds and crush the brewing uprising at any cost…