Strength of Conviction

 
Prerequisite(s): Smite good or Smite evil.
 
Benefit: Each day, you can sacrifice one use of smite evil or smite good to smite a single target regardless of his alignment. You gain no additional bonus on the attack roll, but if you hit the target, you deal a number of extra points of damage equal to your class level.
 
Source: Exemplars of Evil