These Space Marines of the Ordo Malleus’ Chamber Militant are amongst the mightiest soldiers, and deadliest psykers, that humanity has produced. So puissant are the Grey Knights that they more commonly operate not in companies but in individual squads. The Chapter only masses in greater strength to meet the direst calamity, such as the Daemon Primarch Angron’s manifestation in the First Armageddon War. The Grey Knights are the swiftest spear and the keenest sword at an Inquisitor’s call. Although the vainer among the Ordo Malleus might tell themselves they have this Chapter at their command, the truth is that they are extending invitations to the knights of Titan, not issuing summons.