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

Polished Demon Horn (Greater)

ITEM 8
UNCOMMONDIVINESPELLHEART
Price 450 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 24.

  • Armor You gain resistance 5 to unholy.
  • Weapon After you cast an enchantment spell by Activating the horn, your Strikes with the weapon deal an additional 1d6 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 24 basic Will).
Activate Cast a Spell
Frequency once per day
Effect You cast 3rd-rank Fear (DC 24 Will).
Pathfinder Adventure Path: GatewalkersORC