pf2e.fyi
From Pathfinder Adventure Path: Gatewalkers, which isn't enabled.

Pickled Demon Tongue

ITEM 3
UNCOMMONACIDDIVINESPELLHEART
Price 60 gp
Usage affixed to armor or a weapon
Bulk —

This small crystal vial contains the forked end of a demon's tongue, preserved in brine. The spell attack roll of any spell cast by Activating this item is +7, and the spell DC is 17.

  • Armor You gain resistance 2 to acid and attacks by demons.
  • Weapon After you cast an acid spell by Activating the pickled demon tongue, your Strikes with the weapon deal an additional 1d4 acid damage until end of your next turn.

Effect: Pickled Demon Tongue - Armor

Effect: Pickled Demon Tongue - Weapon

Activate Cast a Spell
Effect You cast Caustic Blast.
Pathfinder Adventure Path: GatewalkersORC