The Ordo Malleus is a division of the Inquisition, those exceptional individuals that have waged a covert war for Humanitys continued survival over the last ten thousand years. Every Inquisitor has sworn potent oaths to defend the Imperium from its worst enemies, and those of the Ordo Malleus are concerned with destroying the physical manifestation of Chaos itself: the Daemon. Members of the Ordo have pledged their every waking hour to the discovery and scourging of the daemonic, wherever it is to be found.

There are times when the scale of a daemonic infestation is such that even the most formidable and righteous Inquisitors need to call upon aid to triumph. The slightest lapse in Humanitys vigilance has the potential to allow ravening Daemons to pour into the material dimension in a gibbering tide, hungry for the souls of the innocent. Only one force in the breadth of the galaxy has any chance of stemming such a daemonic infestation: the Grey Knights.