Nemesis Force Weapons are the sacred armaments of the Grey Knights, the secret Chapter raised for the single purpose of destroying daemons wherever they intrude upon reality. Each weapon, whether blade, halberd, warding stave, or great hammer, is a masterwork of psycho-reactive craft, forged from silver-hued alloys and inscribed with hexagrammic wards that make the warp itself recoil.
What sets these weapons apart is their bond to the bearer's own soul. A Grey Knight channels his formidable psychic might through the weapon, and at the moment of impact that will erupts into raw anti-daemonic force. Where such a blade strikes a creature of the warp, it does not merely wound; it severs the daemon's tenuous grip upon the material realm and casts its essence howling back into the immaterium, perhaps for a thousand years, perhaps forever.
Each weapon is attuned to its wielder alone, quiescent in another's grasp, for the bond between knight and blade is forged through arduous ritual and unbreakable faith. The Grey Knights guard the secrets of their manufacture as jealously as they guard their very existence, for these relics are the thin silver line between the Imperium and the horrors that gnaw endlessly at its edges. In the hands of the Emperor's daemon-hunters, a Nemesis weapon is judgement absolute, a promise that even the deathless things of the warp can be made to know an ending.