Mechanicum: War comes to Mars

As the flames of treachery spread outwards through the Imperium, Horus mobilises those forces who are loyal to him, and plots to subvert or destroy those who stand agaist him. A battle is being fought for the heart and soul of all the Imperial forces – the Astartes, the Imperial Army, the Titan Legions and more. In this epic story, the civil war on Mars, and the genesis of the Dark Mechanicum.