pf2e.fyi
From Pathfinder #208: Hoof, Cinder, and Storm, which isn't enabled.

Faultline Hammer

ITEM 6
UNCOMMONMAGICALRAZINGSHOVETWO-HAND-D10VERSATILE-P
Price 250 gp
Usage held in 1 hand
Bulk 2
Category martial
Group hammer
Damage 1d6 bludgeoning

The steel head of this +1 striking earthbreaker has a large crack that zigzags down its center, making it look like it could crack in half with any swing. This belies the hammer's strength; its strikes can shatter stone with ease.

Activate—Create Faultline (concentrate)
Frequency once per day
Trigger You Strike an object or raised shield with the faultline hammer and would deal piercing damage to that object
Effect Until the end of your next turn, any weapon that Strikes the object deals additional damage as though the weapon had the razing trait. The triggering Strike also deals this additional damage.
Pathfinder #208: Hoof, Cinder, and StormORC