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

Pickled Demon Tongue (Major)

ITEM 12
UNCOMMONACIDDIVINESPELLHEART
Price 1750 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 +19, and the spell DC is 29.

  • Armor You gain resistance 10 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 1d8 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.
Activate Cast a Spell
Frequency once per day
Effect You cast 4th-rank Acid Grip.
Activate Cast a Spell
Frequency once per day
Effect You cast 4th-rank Acidic Burst (DC 29 basic Reflex).
Pathfinder Adventure Path: GatewalkersORC