The Devine Adoratrice

Decades before Horus's civil war sunders the Imperium, Raeven Devine, ruler-in-waiting of the world of Molech, prepares for his Becoming, the rite that will elevate him to the rank of Knight and bond him with the mighty war machine that will be his steed for years to come. But traitors within the Sacristans have other ideas and a shocking act of betrayal sets the stage for one of the bloodiest battles of the Horus Heresy.