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

Polished Demon Horn

ITEM 3
UNCOMMONDIVINESPELLHEART
Price 55 gp
Usage affixed to armor or a weapon
Bulk —

This spellheart is fashioned from the tip of a demon's horn that's been polished until smooth and shiny. The spell DC of any spell cast by Activating this item is 17.

  • Armor You gain resistance 2 to unholy.
  • Weapon After you cast an enchantment spell by Activating the horn, your Strikes with the weapon deal an additional 1d4 mental damage until end of your next turn.

Effect: Polished Demon Horn - Armor

Effect: Polished Demon Horn - Weapon

Activate Cast a Spell
Effect You cast Daze (DC 17 basic Will).
Pathfinder Adventure Path: GatewalkersORC