Luck makes your attacks more effective.
Benefit: Once per day as a swift action, you can activate this ability to improve your combat prowess. For 1 minute, if the result of any damage roll you make is below average, you can increase it to one-half the maximum possible (rounded up). This effect works for all damage you deal, whether from physical or magical attacks.
Special: You can select this feat multiple times, gaining one additional daily use each time you take it.
Special: If you have the ability to turn or rebuke undead, you gain one additional daily use of this feat for each daily turn or rebuke use you expend.
Source: Complete Champion, page 61.