The Battle of Molech was a turning point in the Horus Heresy. After an overwhelming initial assault by the Warmaster's forces, small bands of brave Loyalists held out for months. But the insidious influence of Chaos spread through Molech's defenders, and the Knights of House Devine turned against their allies, securing victory for Horus and bringing powerful new allies to his forces. And in the battle's aftermath, Horus walked his own path to a source of great power that would change the face of the war forever…