Warhammer 40K: War Zone Octarius – Book 2: Critical MassIn this 96 page hardback book, you'll find: The gripping conclusion to the story of War Zone Octarius, with consequences that will ripple through the galaxy for centuries to come. Beautiful maps and artwork accompanying the in depth lore sections, featuring the defence of Sigma Ulstari, the assault on Octarius, and an unexpected attack from forces who revel in the carnage An exciting new grand campaign system featuring branching mission trees,