Vandal Drones
When a weapon with this special property deals Hull Point damage to a ship, pieces of the projectile’s shrapnel animate into drones that continue to rend the target. Each successive gunnery phase, the struck starship loses the listed amount of Hull Points until the drones are either forcibly removed during the engineering phase with an Engineering check (DC 15 + 2 × the engineer’s starship’s tier) or shaken off by the pilot during the helm phase with a successful barrel roll, flip and burn, or flyby stunt. Multiple applications of this effect don’t stack; only the highest damage applies.
Source
Alien Archive 3 pg. 61