Bullet warding

Due to the hexagrammatic runes and exorcisms that the Assassin inscribes in tight spirals upon each shell casing, they are able to render Daemons and their ilk vulnerable a microsecond before impact. In this way, they can destroy even aetheric foes blasting through their semi-corporeal forms in an explosion of dissipating ectoplasm.

"Dataslate: Officio Assassinorum"