The galaxy-spanning civil war known as the Horus Heresy tore the Imperium apart, and at its heart stood the Primarchs – the genetically engineered sons of the Emperor. This ranking dives deep into their legendary status, from the unwavering loyalty of Roboute Guilliman to the insidious betrayal of Horus Lupercal himself. Explore where the tactical genius of Perturabo, the noble sacrifice of Sanguinius, and the raw fury of Angron fall. Discover which of these demigods proved to be the ultimate warriors, leaders, and, ultimately, the architects of the Imperium's darkest hour.