Warhammer 40,000: Daemonhunters

“You must face the truth squarely and without flinching from duty. Our enemies are mortal no longer. Mercy for such as they is a chimera, self-deception is its only ally. Dedicate this weapon, given unto your hand at the behest of the Emperor, to their destruction. Regard its function as your only duty: you live only to bring cleansing fire. Take up your rod and staff, your armour and psycannon, and go forth.”

Galbus Heer – Lectures to the Ordo Malleus

The greatest threat to the Imperium of Man is, and has always been, the followers of Chaos and the foul daemons of the Warp. The Inquisitors of the Ordo Malleus are at war with forces too terrible to comprehend and, together with the holy warriors of the Grey Knights, they must take the light of the Emperor into the darkness. The threat of the daemonic is so good that only these heroic warriors have the necessary skills and knowledge to stand against such diabolical foes.

Blurb from Codex Daemonhunters.