From Pathfinder Lost Omens The Mwangi Expanse, which isn't enabled.

Spine Stabber

FEAT 1

The quills on your arms are particularly sharp and sturdy. You gain a quills unarmed attack that deals 1d6 piercing damage. Your quills are in the knife weapon group and have the finesse and unarmed traits.

Pathfinder Lost Omens The Mwangi ExpanseOGL