Vortex
A weapon with this special property creates a spiraling cyclone of gravitons that tears, crushes, and twists everything in its path, reducing a target ship’s speed by half and reducing its maneuverability by one step for 1d4 rounds on a hit. A ship protected by functioning shields takes no damage from a vortex weapon, but the target ship’s pilot must succeed at a Piloting check (DC = 15 + 1-1/2 × the target starship’s tier) or the hit depletes all Shield Points in that arc.
Source
Core Rulebook pg. 305
