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

Robe of the Erinys (Major)

ITEM 13

Price 2750 gp

Usage worn garment

Bulk —

This exquisite scarlet robe embroidered with golden depictions of fiends and their weapons is fashioned after the garb of the cloistered Sisters of the Golden Erinys. The robe's belt is embroidered to look like a snake, complete with metal fangs.

Activate—Biting Belt (concentrate, manipulate)

Frequency once per day

Effect You remove the robe's belt and snap it at an enemy within your reach. As you do, it briefly animates to bite that foe, dealing 6d8 poison damage with a basic DC 31 Fortitude save. On a critical failure, the target is also Sickened 1.

Pathfinder Adventure Path: HellbreakersORC