Burrowing
A weapon with this special property fires a highly focused beam of energy that can slice through shields with ease. Burrowing weapons are always short range and cannot fire at targets outside the first range increment. When a burrowing weapon’s beam hits shields, apply half of its damage to the shields and the other half (rounded down) to the target vessel’s Hull Points. If any of the damage applied to the shields depletes those shields, apply the remainder to the ship’s Hull Points as normal. If a burrowing weapon deals damage to a ship with a damage threshold, halve that threshold before determining if any damage is dealt.
Source
Pact Worlds pg. 153