Cobalt Power( Magic of Incarnum, p. 37)
By channeling the soul energy of brutal warriors past, present, and future, you become more capable of overcoming your enemies through sheer strength.
Power Attack (PH) , CON 13, STR 13,
Once per day, you can invest essentia into this feat. You gain an insight bonus on attack rolls or ability checks made to succeed on a bull rush, overrun, or sunder attack equal to the invested essentia. You also gain an insight bonus equal to the invested essentia on damage rolls made when using Power Attack (up to a maximum value equal to the penalty accepted on the attack roll). Once the amount of essentia invested is chosen, it cannot be altered and remains invested for 24 hours. You gain 1 point of essentia.