When the dust settled in the decades after the Siege of Terra, the mighty Space Marine Legions were broken into Chapters and granted autonomy from Imperial authority. Among the Blood Angels and their new Successors, it became increasingly apparent that their Primarch's death had left a last imprint that no Chaplain could have predicted, and no Sanguinary Priest could cure. Opposing the Red Thirst -- that bloodlust that beats in the heart of every Son of Sanguinius -- their new curse was a more solemn and spiritual malady. The condition goes by several names, including the Fate, the Primarch's Curse, and the Chaplain's Vigil. But most Blood Angels know it by a bleaker title, spoken in whispers on the eve before a battle.