Having declared its secession from Imperial rule at the very dawn of the Horus Heresy, Mars sat like a viper upon the doorstep of the Loyalist Throneworld – a locus of industry which toiled ceaselessly in preparation for the inevitable Traitor assault upon Terra. Loyalist incursions throughout the civil war would attempt to stymie these efforts, but eventually, the power of Mars would be unleashed against the Sol System in a maelstrom of violence.

This expansion book for Warhammer: The Horus Heresy digs deep into the conflict on Mars, home to some of the most bitter fighting in the Age of Darkness. Recreate the key battles with thematic Relic Hunt missions, a new campaign, and rules for additional units.