Iaijutsu Master( Oriental Adventures, p. 63)
You are not only descended from Kakita, the greatest duelist ever to have lived, but you share a karmic tie to his spirit.
Once per day, you can make any one attack roll, saving throw, or skill check using your Iaijutsu Focus skill modifier in place of all other modifiers. For example, you can roll a melee attack roll using only your Iaijutsu Focus skill modifier instead of your total attack bonus (including Strength modifier, weapon enhancement bonus, Weapon Focus bonus, size modifier, and all other bonuses to your attack roll). You give up all your other modifiers and use your skill modifier instead.