Unbalance Opponent

The character is skilled at keeping her opponents off balance in close combat.
Prerequisites: Defensive Martial Arts, base attack bonus +6.
Benefit: As a 1-act action, the character designates an opponent no more than one size category larger or smaller than the character. That opponent doesn’t get to add his Strength bonus to attack rolls when targeting the character for the next round, until the beginning of the character’s next turn. (If the opponent has a Strength penalty, he still takes that penalty.)
Normal: The opponent’s Strength modifier applies to damage, as usual.