You can strike hard against anyone who attacks you in a cowardly fashion.
Prerequisite: Cha 13, ceremonial oath to uphold a knightly code of conduct
Benefit: A number of times per day equal to 1 + your Charisma modifier, you gain a bonus to your attack and damage rolls equal to your charisma modifier against a dishonorable opponent. This opponent must, in the current encounter, have attempted a dishonorable strike. Dishonorable strikes include all ranged attacks, Sneak Attacks, ambushes, poison use, subtle magical attacks (GM adjudication), or attempted an attack while you are helpless, surprised, or massively and obviously outclassed (CR is 7 or greater than your current character level).