The angels of the past of now the monsters of an age of ashes. Sacred Mars is a desecrated world, the Traitor Legions are running for their lives. Those left behind fight to secure the future of the Imperium, and humanity.

The Emperor is silent. Sacred Mars is a desecrated world of nightmare machines and the forge fanes of the Dark Mechanicum. In the emptiness between the stars, the Traitor Legions are running for their lives.

In this cauldron of ruin, Titus Prayto fights to secure the future of the Imperium, a future which only the Space Marines can protect. Ortag Theokon of the Iron Warriors seeks sanctuary amongst the wasteland of a lost war. Apollyon of the Blood Angels fights for salvation with the shadow of his father’s death clinging to his back. While primarchs and High Lords scramble for power, Mouhausen, once Chosen of Malcador, seeks to balance the needs of the future against the fury of the present.

The angels of the past are now the monsters of an age of ashes.