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

Token of Salt and Earth

ITEM 6
Price 225 gp
Usage worn
Bulk —

This charm is usually worn around the neck or hanging from a belt. It consists of a three-part hourglass with individual glass bulbs filled with sea salts, charcoal ash, and minute slivers of silver. It grants the wearer a +1 item bonus to Stealth checks to Hide and Sneak from creatures with the unholy trait.

Activate—Hide from the Hateful (illusion, manipulate, occult, subtle)
Frequency once per day

Effect By rotating the charm along one of its concentric rings, you become Invisible to creatures with the fiend, fey, or undead trait (your choice) for 1 minute. If you use a hostile action, you're no longer invisible after the action is completed.
Pathfinder Adventure Path: HellbreakersORC