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The Horus Heresy Book One - Betrayal

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The Horus Heresy Book One - Betrayal
Author(s) Alan Bligh
Released October 2012
Pages 289
ISBN ISBN 9781907964961

ISBN 9781788266086 (2014 softback edition)[2]

Followed by Book Two - Massacre

The Horus Heresy Book One - Betrayal is the first book in the Horus Heresy series by Forge World.[1]

The book deals with the events starting from the end to the Great Crusade until the Battle of Isstvan III. It contains rules and special characters for the pre-Heresy Sons of Horus, World Eaters, Emperor's Children, and Death Guard as well as a Space Marine Crusade Legion army list.[1]

Initially published in 2012, a revised edition was printed in 2014.[2]


Most of the book is presented as a record written by "A.K." shortly after the Horus Heresy. The first part of the book is a history treatise concerning the Unification Wars, the unification with Mars, the construction of the Astronomican, the founding of the Space Marine Legions and their victories, the Ullanor Crusade, and the seed of treachery that grew within Horus.[1]

The Death of Isstvan III

This section describes the Isstvan system, its compliance and rebellion, and the Battle of Isstvan III from planetfall to virus bombardment.[1]

The Space Marine Legions

This section contains in-depth information on the history of the four Space Marine Legions involved in the Battle of Isstvan III:[1]

as well as the Legio Mortis Titan Legion

The Death of Isstvan III Campaign

This section describes a six-mission campaign for reenacting the Battle of Isstvan III on the tabletop.[1]

Campaign Appendix: Zone Mortalis

This section contains rules for zone mortalis battlegrounds; fighting in confined spaces such as starships and urban environments.[1]

Age of Darkness Battles

This section contains rules for Space Marine Legion army lists set the late Crusade and early Heresy. It describes the force organization chart, allies matrix, units, armour, and wargear available to the Legiones Astartes in general.[1]

Space Marine Crusade Legion Army List

Rueles for playing games of Warhammer during the Horus Heresy, and full army Lists for the Space Marine Legions as they were during the Great Crusade.[1]

Dedicated Transports

Fast Attack
Heavy Support
Lords of War

Space Marine Crusade Legion Appendix

Mechanicum Army List Appendix

This section contains units for building an Adeptus Mechanicus allied force for a Legiones Astartes army.[1]


  • Apocalypse Rules appendix[1]
  • Additional Special Rules[1]
  • Selected New Special Rules Summary[1]


Publications Table