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The Horus Heresy is over. The vengeful Imperium turns its eyes towards Mars – a world of nightmare machines and the holdouts of the traitorous Dark Mechanicum.
As the war heads towards the Martian cauldron of ruin, an Ultramarine fights to secure the future of the Imperium, a defeated Iron Warrior seeks sanctuary among the wasteland beyond the light of Sol, and a Blood Angel fights for salvation in the shadow of his father's death.
Meanwhile, back on Terra, while primarchs and High Lords scramble for power, Moriana Mouhausen, once of the Chosen of Malcador, seeks to balance the needs of the future against the fury of the present.