Critical Mass: Octarius Book 2


Continue the Octarius Campaign with the new Book 2: Critical Mass! Including Updates Index Rules, Legendary Missions, Relics, Campaign Rules and so much more.

Available to Backorder (Stock expected in 5-10 days)


Octarius Book 2: Critical Mass is a 96-page hardback book containing all the information about the conclusion to War Zone Octarius.

The Hive Fleet Leviathan approaches the Octarius sector’s heart, all while the forge world of Sigma-Ulstari is fighting for its life against multiple xenos invasions. As desperation grows and the grim fate of billions hangs above them, forces from all sides gather their deadliest weapons and get ready for the Octarian War’s apocalyptic conclusion.

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A copy of the Warhammer 40,000 Core Book is required to use the contents of this book.

Critical Mass Contents

Find the full list of contents below:

  • Conclusion to War Zone Octarius
  • Maps and Artwork – Featuring the Defence of Sigma-Ulstari, Assault on Octarius and the Unexpected Attack from Forces
  • New Grans Campaign System – Featuring Branching Mission Trees, Impromptu Alliances and Victory Bonuses
  • Crusade Content – Including Relics and Advancements
  • Expanded Rules for Orks Armies – Including Codex Supplement for Blood Axes Clan, Speed Mob Army of Renown and Return of Looted Vehicles
  • Rules for Using Astra Cartographica Rogue Traders and Voidsmen Crew

Additional information

Weight 0.619 kg



Warhammer 40k


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