Mark of Calth
Aaron Dembski-Bowden 
Graham McNeill 
Dan Abnett 
Rob Sanders 
David Annandale 
Guy Haley 
Anthony Reynolds Narrated by Jonathan Keeble , David Timson , Gareth Armstrong
The Horus Heresy, Book 25
- Released
- October 10, 2017
- Length
- 12 hrs 53 mins
- Format
- Unabridged Audiobook
- Publisher
- Black Library
In "Calth That Was" by Graham McNeill, the Ultramarines of the XIIIth Legion are unexpectedly betrayed by the XVIIth during a catastrophic event known as the Heresy, plunging them into chaos. As solar flares ravage the planet, the remaining survivors must confront the Word Bearers and their allies or risk damnation in the depths of the arcology shelters. This gripping novella chronicles the pivotal moments that will forever change Captain Ventanus and the fate of the Ultramarines Chapter for the next 10,000 years.
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False Gods
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The Red Fief
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The Broken Chain
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Galaxy in Flames
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The Flight of The Eisenstein
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Fulgrim
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Descent of Angels
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