Rogue Trader - The Koronus Expanse
The Graviton Gun fires a stream of particles that disrupt the localised gravimetric field around the target area, increasing the apparent mass of the enemy and slowing if not pinning them outright to the ground. While the enemy is normally not harmed greatly, they are incapacitated until the effects wear off. As it is not a lethal device, the Graviton Gun is useful for when someone must be captured alive rather than dead. They are exceedingly rare relics from the Dark Age of Technology, and each is a sacred device jealously guarded by the Adeptus Mechanicus – who very rarely allow one outside of their armouries.