Vashtorr the Arkifane, daemon demigod of the soul forges, has fixed his gaze upon the Rock. Somewhere deep within the spacefaring battle station and fortress-monastery of the Dark Angels lies a prize that the Arkifane will spend countless lives to seize. Gathering a terrifying Balefleet around him, riding to battle aboard the most vast and grotesque Ark of Omen yet, Vashtorr closes his ironclad talons around the heart of the Dark Angels Chapter and prepares to crush it.

Yet the Dark Angels are a stubborn and strategically brilliant Chapter. Even in the face of such sudden and calamitous adversity, their grim resolve comes to the fore. Rousing every warrior and weapon at their disposal, the Dark Angels dig in and prepare to fight for every corridor, every echoing chamber, dark oubliette and shadowed stairway. They are led in their defence by Supreme Grand Master Azrael, who will see the servants of the Dark Gods driven from the Rock no matter the cost.

As battle rages and the fight grows ever more desperate, neither inv