From Pathfinder Howl of the Wild, which isn't enabled.

Abscission Shards

FEAT 6

Activity 1 action

Requirements Your last action was a successful frenzied claw or spinning talon Strike.

You twist your claw, breaking off a piece in your target. The shard deals 1d6 persistent bleed damage. This increases to 2d6 if your unarmed attacks deal three weapon damage dice, such as under a greater striking rune, and 3d6 if they deal four weapon damage dice.

Pathfinder Howl of the WildORC