Warhammer 40,000 (7th Edition): Imperial Agents Codex

FOR THE EMPEROR!

While the Imperium draws great advantage from the unbelievable weight of manpower it can bring to bear, its diversity of military forces is its greatest strength. The arcane of technology of the Adeptus Mechanicus, the psychic prowess of the Grey Knights, the unrelenting zeal of the Adepta Sororitas, and the skills of many other esoteric factions are called upon in the prosecution of the Emperor's wars across Humanity's realm. Though the forces of the Imperium are myraid and distinct, they all work to ensure a single common goal: enforcing the Emperor's divine will, and thus ensuring the continued survival of Mankind.