By command of Primarch Roboute Guilliman, the ancient empire of the Five Hundred Worlds shall rise anew in the Imperium's darkest hour. Demetrian Titus, now Captain of the Ultramarines Second Company, fights at the forefront of this war of reclamation. Yet the task that lies before him and his battle-brothers is titanic. Upon the blighted world of Novamagnor, Titus meets a malevolent foe in a battle of wits and will. Can he defeat the monstrous Nekrosor Ammentar, its Destroyer legions, and its stygian shards of the Nightbringer, or will Novamagnor and all its defenders be smothered beneath the shroud of death?.