Cuthbert's Smite( Dragon Compendium)
You can smite chaotic creatures as well as evil ones.
Ability to smite evil, Patron deity St. Cuthbert,
Your smite evil class ability also works against chaotic creatures. Additionally, you may use your smite ability one more time per day. If you accidentally smite a creature that is not chaotic or evil, the smite has no effect but is still used up for the day. Smite evil and smite chaos are supernatural abilities.