The Hive World of Vierdina has fallen. Madmen, heretics, and mutants alike throw themselves at the few loyal holdouts that remain, and the streets run crimson with blood. Blasphemous rituals and sacrilege are commonplace as the degenerate slaves of Chaos prepare to rip the fabric of the Materium itself asunder. Should they succeed, countless worlds shall fall before the onslaught of daemonic legions.
Yet even in this darkest of nights, the Light of the Emperor shines true. After weeks of fighting behind enemy lines, embattled servants of the Inquisition and their allies break through to the extraction zone. They carry with them a sorcerous grimoire that may be the key to saving the entire sub-sector.