The war which unfolded upon Tallarn in the middle years of the Horus Heresy was on a scale almost impossible to assess, a year-long conflict of ceaseless battle across a thousand fronts, where entire Titan Legios were broken and Imperialis Auxilia regiments rendered extinct.

Contained within this 128-page hardback book you will find a comprehensive history of the Devastation of Tallarn and the Fall of Sapphire City, key events in the vast and nightmarish Tallarn campaign. As well as detailing the Loyalist and Traitor forces which took part in these engagements, this book features new Formations and Detachment Data Sheets for both the Legiones Astartes and Solar Auxilia Army Lists.

This supplement book presents a full campaign system for linking Legions Imperialis battles together, including Breakthrough Campaign rules where you can take the fight right to your opponents' strongholds, and an expansion to this system allowing players to fight the battles for the Northern Desolation. The book contains rules for fighting Legions Imperialis battles in the dense toxic fogs which shrouded the battlefields of Tallarn, allowing you to bring this wartorn planet's intense and choking environments to life on the tabletop. You'll also find rules for Spearhead games featuring unique missions for massive armoured columns – ideal for representing the unusual conditions on Tallarn.

In order to use the content of this book, you will require a copy of the Warhammer: The Horus Heresy – Legions Imperialis Rulebook, available separately.