Following the 'Argosa Uprisings' in 482.M39, the Retributor Chapter of the Adeptus Astartes is tasked with assisting in the hunt for fleeing renegades and their leaders, and bringing down the Emperor's justice for their crimes.
A Necron dynasty, dormant for eons, rises in the depths of the Nephilim Sector, now inhabited by fleshy interlopers in the Pariah Nexus. Led by Necron Cryptek Illuminor Szeras, they seek to reclaim dominance on the planet Paradyce.
As Drukhari raiders plague an Imperial planet, the Astra Militarum send out a desperate cry for help. Salvation arrives in the form of a force of Space Marines, but the population of the planet soon learn to be careful what they wish for.