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From Pathfinder Impossible Magic, which isn't enabled.

Shatterpoint Ammunition (Major)

ITEM 12
Price 400 gp
Bulk L

Ammunition any

Activate (manipulate)

Crafted out of spite to counter a caster's animated objects, shatterpoint ammunition hums quiet songs of destruction. When activated shatterpoint ammunition hits a target, the damage the ammunition deals ignores the target's Hardness if it's 12 or lower. In addition, the target takes 3d8 persistent sonic damage from the vibrations.

Pathfinder Impossible MagicORC