Grav weapons are exotic armaments that turn the force of gravity itself into a weapon, projecting fields that crush their targets under sudden, immense weight. Rather than firing a projectile or beam, a grav-gun intensifies gravitational force upon whatever it strikes, pulping flesh, buckling armour plate, and shattering bone under pressures that no natural body could endure. This unusual mode of attack makes grav weapons especially deadly against heavily armoured foes, for the tougher and denser the target, the more savagely the weapon's force is turned against it.
The secrets of grav technology are ancient and only partly understood, and the weapons are jealously controlled by the Adeptus Mechanicus. Producing and maintaining them demands rites and knowledge that few possess, so they remain uncommon and precious across the galaxy.
Where they do appear, grav weapons are most often carried by elite formations of the Space Marines, who deploy them to bring down enemy champions, terminators, and armoured vehicles that would resist conventional fire. The family includes handheld grav-guns, pistols, and heavier grav-cannons, as well as vehicle-scale weapons. Silent but for a deep, resonant hum and the sickening crunch of collapsing matter, grav weapons embody the strange, half-remembered science of a fallen technological age, wielded by those trusted to keep such power alive.