
- BGG rank
- BGG #2,238
- BGG rating
- 8.2
Gaslands: Refuelled
- 2–8 players
- 45–90 min
- Complexity 2.7/5
- 2019

Rules assistance for The Horus Heresy: Book Three – Extermination
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

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Answers come from the official rulebook, with the page to check.
The Horus Heresy: Book Three – Extermination is an expansion for Warhammer 40,000 (Sixth Edition) released in 2014 for 2 players. It was designed by Alan Bligh and its main mechanics are Variable Player Powers and Dice Rolling.
The third and final part of the Isstvan trilogy, this book details the aftermath of the Dropsite Massacre on Istvaan V, and two other major battles fought between the Loyalist and Traitor Legions as the Horus Heresy swept out from the Isstvan system and into the wider Imperium of Mankind: the Battle of Phall and the Invasion of Paramar. Also featured are the background and game rules for the units, characters and vehicles of the four Legions covered in this book: the Alpha Legion, Imperial Fists, Raven Guard and Iron Warriors, and a Mechanicum army list, as well as new campaigns and missions. The book itself is a full colour 285 page hardback, leather bound with metal corner clasps, foil-edged pages and embossed and silvered text.
The Horus Heresy: Book Three – Extermination supports 2 players according to the catalogue. This is the publisher’s listed player count, so the game is designed for exactly that number of participants. Variants for other group sizes, if any, are described in the rulebook of your edition, so check it before setting up a different configuration.
The Horus Heresy: Book Three – Extermination belongs to these categories: Wargame, Miniatures, and Science Fiction. Its main mechanics are Variable Player Powers and Dice Rolling. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of The Horus Heresy: Book Three – Extermination are: Alan Bligh. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists The Horus Heresy: Book Three – Extermination as an expansion for Warhammer 40,000 (Sixth Edition). Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need Warhammer 40,000 (Sixth Edition) to use it. Check that your edition of Warhammer 40,000 (Sixth Edition) is compatible, as some expansions were revised between editions.