Advent Calendar 2018: Day Sixteen Seeking to atone for the sin of Imperium Secundus, Roboute Guilliman throws himself at enemies – and a force of World Eaters provide the perfect target. READ IT BECAUSE Guilliman's guilt over creating a breakaway Imperium during the Horus Heresy is a fascinating aspect of his character, and this story explores it in the midst of brutal battle. THE STORY Imperium Secundus is over. A vision granted to Sanguinius shows that the Emperor is alive, and so the Triumvirate of primarchs who formed the breakaway empire have taken to their fleets and intend to make the traitors pay for their heresy. But in his heart, Roboute Guilliman, architect of Imperium Secundus, feels as much a traitor as any of them – and he seeks to atone for his sin by throwing himself at enemies. When a force of World Eaters threaten a world that embodies the Imperium's ideals, he finds the perfect target…