The Ordo Malleus (lit.: Order of the Hammer ) is one of the three major Ordos of the Inquisition It is tasked with the responsibility of investigating and destroying the physical manifestations of Chaos throughout Norrath.

Known colloquially as Daemonhunters, the members of the Ordo Malleus are individuals of great strength of will, able to face the agents of Chaos without flinching. The strength of the inquisitors of the Ordo is bolstered by their Chamber Militant, the Grey Knights.

Foundation

The Ordo Malleus is the oldest arm of the Inquisition, created by decree of the High Lords of Allied Nations prior to the shattering.  Many believed that others must fill the role guarding humanity from the Void, to thwart the designs of the Chaos Gods.

They shall be My Hammer, the sword in My hand, the gauntlet about My fist, the bane of My foes and woes of the treacherous. When no others may stand beside them, they shall fight. Only the greatest shall enter their ranks, for unto them do I entrust stewardship over the Gates of Hell.

Historians and savants point to this declaration, known as the Charge of the Malleus, as the Ordo's founding moment. 

Role

The power and authority of the Ordo Malleus extends beyond the nominal boundaries of the Inquisition, a jurisdictional extension known as the Malleus Remit. In events of grave emergency concerning potential daemonic threats, a Malleus Inquisitor may demand the services and resources of any allied servant or allied organization, a request which may not be refused on pain of death. Even the High Lords of a Region are beholden to follow the Malleus Remit without hesitation.

In normal circumstances, the Ordo Malleus focuses its investigations toward two main threats:

• The Daemon Without: daemons that have physically manifested in the material universe and mortals dedicated to the service of Chaos
• The Daemon Within: inquisitors declared Extremis Diabolus for heretical actions.

Organization

The Ordo Malleus follows the modern structure of the Imperial Inquisition

Military forces

The armies of the Ordo Malleus are small, as only a select few individuals are trusted by the Inquisition with extensive knowledge of Chaos. Daemonhunter strike forces usually consist only of a Malleus inquisitor, the inquisitor's personal retinue, and as many Grey Knights as can be spared.

In battle, the greatest advantage of any Malleus force lies in the specialized and consecrated weaponry available to it. Utilizing techniques and metallurgy lost to the rest of Norrath, Malleus savants and allied priests produce and maintain immensely powerful arms and armour specifically designed to combat the daemonic.

In addition to this equipment, the Malleus Remit allows any Daemonhunter strike force to be bolstered by units from any force in any region.

Grey Knights

Millennia-old aegis armor inscribed with wards protects the bodies and souls of the Grey Knights against physical, psychic, or daemonic assault. The faith of Grey Knights, combined with their innate psychic talents, is so pure that it can cause daemons physical damage and pain and weaken their ties to the material realm.