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The Dark Imperium series in Warhammer 40,000 runs to 4 books. Below is the full reading order in series sequence, so you know exactly where to start Dark Imperium and what to read next.
Original summaries and chronology labels generated from the same catalog powering the atlas.
Guy Haley
A central modern-era novel about Guilliman's returned Imperium facing strategic, political, and daemonic pressure in Ultramar.
012.M42 - 012.M42
approximate date, medium confidence
First published 2017
Guy Haley
The Plague Wars escalate as Ultramar becomes a strategic and ideological test case for the revived Imperial order.
012.M42 - 012.M42
approximate date, medium confidence
First published 2018
Guy Haley
The Dark Imperium trilogy closes with the Plague Wars pushing into questions of faith, power, and what the returned primarch can actually fix.
012.M42 - 012.M42
approximate date, medium confidence
First published 2021
Guy Haley
A short story set in the Dark Imperium era, after the rebirth of Roboute Guilliman and the splitting of the galaxy. It offers a brief, focused glimpse of the grim new age of the 41st/42nd millennium and its defenders. Best read as a supplement to the broader Dark Imperium storyline rather than a standalone introduction.
999.M41 - 999.M41
approximate date, medium confidence
First published 2019