When your opponent is unable to adequately defend against them, your precise unarmed strikes break bone and tear tissue.

Prerequisite: Dex 13, Unarmed Combatant, Jawbreaker, Stunning Fist, Heal 9 ranks.
Benefit: When you make a successful Stunning Fist attempt against an opponent that is grappled, helpless, or stunned, you can forgo any other Stunning Fist effect to deal 1d6 Strength or Dexterity damage to that opponent.