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From Pathfinder #164: Hands of the Devil, which isn't enabled.

Hunter's Brooch

ITEM 4
UNIQUEDIVINEINVESTEDVITALITY
Price 80 gp
Usage worn
Bulk L

While wearing this silver religious symbol of Erastil, you can cast the Vitality Lash cantrip as an innate divine spell.

Activate command, Interact
Frequency once per day
Effect By touching a weapon you wield to the symbol and uttering a plea for Erastil's steadying hand, you grant that weapon the deadly d12 trait. Against undead, the weapon instead gains the fatal d12 trait. This blessing lasts for 1 minute, until you score a critical hit with the weapon, or until you aren't wielding the weapon.

Effect: Hunter's Brooch

Pathfinder #164: Hands of the DevilOGL