Weapons with the Piercing ability can go through one or more enemies, dealing 100% of the normal damage every hit.

Upon being fired, the weapon has a Piercing Momentum equal to the Piercing number. Every time it hits a target, the Piercing Momentum decreases by 1 (plus the amount of Counter Pierce). When the Piercing Momentum reaches 0, the weapon can no longer pierce targets and subsequently disappears.