Shatter

The first time a weapon with this property is used on a target, the weapon has the penetrating special property. However, if the weapon’s damage is dealt to the same target continuously over subsequent rounds, the amount of Hardness the weapon ignores = 3 × the weapon’s item level. If the weapon bearing this property is modal, the damage type dealt by the weapon must change each round, or the weapon functions only as a penetrating weapon.

A penetrating weapon is designed to punch through large objects’ outer layers, making it easier to damage them. A penetrating weapon ignores an amount of hardness equal to the weapon’s level.