Dark Imperium Black Library New! Today
(2018/2021): Focuses on the "Plague Wars of Ultramar," where Guilliman defends his home system against his corrupted brother, Mortarion, and the Death Guard.
The series begins roughly a century after the events (though 2nd Edition revisions retimed this to roughly 12 years into the crusade). The galaxy has been split in two by the Cicatrix Maledictum , a massive warp rift that has plunged half the Imperium into darkness. dark imperium black library
The central pillar of Dark Imperium is the return of Roboute Guilliman, the Primarch of the Ultramarines. For a setting that had long since elevated its demigod leaders to the status of myth, seeing a Primarch in the "modern" day was a shock to the system. (2018/2021): Focuses on the "Plague Wars of Ultramar,"
The titular weapon in Godblight is terrifying. It is a poison that reverses the Imperial faith. If Mortarion injects it into a planet, the planet begins to believe that the Emperor is dead, that Nurgle is love, and that decay is salvation. It weaponizes hope by corrupting it into despair. The central pillar of Dark Imperium is the
Guilliman is a secular humanist (by 30k standards) trapped in a theocratic nightmare. He openly debates with a Cardinal of the Ecclesiarchy, arguing that the Imperial Cult is a lie built on a corpse. His greatest enemy is not just Mortarion’s plague, but the Imperium’s own fanaticism. The series asks: Can you save a species that worships the very stagnation you are trying to cure?
Godblight currently holds a 4.6/5 rating on Goodreads and is frequently listed in "Top 10 Black Library Books of All Time" lists. Fans have praised Guy Haley for humanizing Guilliman—showing him not as a perfect demigod, but as a depressed, lonely son who just lost his entire family and woke up in a hell he cannot fix.
Before the Dark Imperium , the Warhammer 40k narrative was frozen. After this trilogy, the clock started ticking again.
