From Pathfinder Adventure Path: Hellbreakers, which isn't enabled.

Thorn of Milani (Moderate)

ITEM 7

Price 60 gp

Usage affixed to weapon

Bulk —

Activate (concentrate)

Trigger You hit a creature with the affixed weapon.

This pure white thorn glows bright with the spirit of justice. When you activate the thorn, you deal an additional 2d4 spirit damage with the holy trait.

Effect: Thorn of Milani (Spirit Damage)

Pathfinder Adventure Path: HellbreakersORC