Release Date: 27 July 2025

The Space Marine Legions of the 31st Millennium field a diverse and formidable range of genetically enhanced warriors and advanced war machines superior to any other military force in the galaxy. As an Age of Darkness falls across the stars and the fires of rebellion rage out of control, the armies used to forge the Imperium turn upon each other in an apocalyptic civil war – the Horus Heresy.

This book is an essential guide for anyone who wants to command a Traitor Legiones Astartes force in Warhammer: The Horus Heresy. It contains the rules you need to field the vast panoply of units available to Traitor forces, from core squads, vehicles, and weapons shared by every Space Marine Legion to specialist rules for each of the Traitor Legions – including Detachments, unique Wargear, signature units, and their legendary Primarchs.

This 348-page hardback book contains:
– Background and lore: Information on the Legiones Astartes, their organisation, and examples of their forces.
– Rules and unit profiles: A guide to army building, plus rules for units, weapons, and Wargear available to the Traitor Legiones Astartes in Warhammer: The Horus Heresy.
– Legion-specific special rules: Unit profiles, Detachments, Gambits, Wargear, Faction Abilities and Reactions for each of the Traitor Legions: the Emperor's Children, Iron Warriors, Night Lords, World Eaters, Death Guard, Thousand Sons, Sons of Horus, Word Bearers, and Alpha Legion.
– Primarch profiles: Rules to unleash Fulgrim, Perturabo, Konrad Curze, Angron, Mortarion, Magnus the Red, Horus Lupercal, Lorgar, and Alpharius on the battlefield.
– Visual showcases: Heraldry markings, colour schemes for infantry and vehicles, and a gallery of stunning miniatures photography for each Traitor Legion.
– Loyalists in the midst: Rules for Saul Tarvitz and Garviel Loken so that you can use forces still loyal to the Emperor.

You will need a copy of Warhammer: The Horus Heresy – Age of Darkness Rulebook, available separately, to use the contents of this book.

The Horus Heresy

Liber Hereticus: Traitor Legiones Astartes Army Book