It is the 41st millennium and humanity teeters on the brink of destruction. Yet out of the darkness comes a cold hope. The Adeptus Mechanicus are logical, remote beings of cybernetic construction. Their armour is a work of mechanical art, their weapons unparalleled in intelligent design. One of the most hostile fighting forces of the Imperium, the Priesthood of Mars serves justice upon their enemies with forbidding momentum. Though nominally allied with mankind, it is in the name of the Omnissiah that their mighty war machines step forth into the cauldron of war, for the Machine God alone is worthy of their sacrifice and neither man nor xenos can deter them from their single purpose of championing his dominion. This anthology contains a dozen gripping tales about the formidable Titans, Imperial Knights, battle-servitors and skitarii legions with which the Adeptus Mechanicus wage war, all written by some of Black Library's most popular authors, including Graham McNeill, Gav Thorpe, Josh Reynolds, Rob Sanders, David Guymer, David Annandale and Andy Clark.