From Pathfinder #208: Hoof, Cinder, and Storm, which isn't enabled.

Rending Gauntlets (Greater)

ITEM 19

Price 32000 gp

Usage worn bracers

Bulk L

These heavy gloves are reinforced with thick animal hide and sharpened bone.

Activate—Shredding Finisher (manipulate)

Frequency once per hour

Requirements You hit the same creature with two unarmed Strikes in the same round

Effect The gauntlets' spikes dig into the creature just before you tear them free, dealing 6d6 piercing damage.

Pathfinder #208: Hoof, Cinder, and StormORC