Piercing Palm (Martial Arts Maneuver)
From D&D Wiki
If you focus all your power on a smaller plane of contact, it's only natural to draw blood.
Level: Hard 3
Type: Action (Attack)
Prerequisites: Strength 15, 4 Hard Flow maneuvers.
Description: Your unarmed attacks become adamantine and do piercing damage. The critical multiplier of your unarmed strikes increases by 1.
Special: Activating this maneuver is a swift action rather than a standard action. Its effects apply to all attacks you make during your turn.