Your weapon blazes with the power of the sun.
Benefit: Once per day as a swift action, you can cause one of your melee weapons to glow with the power of the sun. The illumination radius is the same as that of a torch, but the light is true sunlight and affects creatures within a 10-foot radius as such. This effect lasts for 1 minute.
While your weapon glows, it deals an additional 1 point of sacred (if your deity is good or neutral) or profane (if your deity is evil) damage per character level you possess to any undead it strikes.
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 62.