Awesome Smite( Complete Champion, p. 55)
Through a combination of sheer muscle and mystical acumen, you can deliver devastating smite attacks.
Power Attack (PH) , Base attack bonus +6, smite ability,
This feat allows the use of three tactical maneuvers, each of which requires that you make a smite attack while using the Power Attack feat (minimum attack penalty -l). You must declare the use of this feat before making the attack roll. You can employ only one of these maneuvers at a time. Demolishing Smite: Your smite attack punches through your enemy's defenses. For the purpose of this single attack, you can ignore a number of points of damage reduction (except DR/-- or DR/epic) up to twice your Charisma bonus (if any). For instance, if your Charisma is 17 (+3 bonus), you ignore 6 points of your target's damage reduction when making a demolishing smite. Overwhelming Smite: Your smite attack can knock an opponent prone. If the attack hits and deals damage, it is treated as though it were also a trip attack. Make a Strength check opposed by the defender's Strength or Dexterity, with all the normal trip modifiers (PH 158). A foe that resists is not entitled to make a trip attempt against you in return. You can attempt an overwhelming smite only once per round. Seeking Smite: Your smite attack is uncannily guided to its target. For the purpose of this single attack, you ignore any miss chance your foe might have, though your weapon must still be able to strike the target. Thus, while this maneuver allows you to strike an incorporeal creature unerringly with a magic sword, it does not allow you to strike it with a nonmagical weapon.