Initiate of Bahamut (Feat)

Once per day, you can smite evil (as the paladin class feature, PH 44), using your cleric level as your paladin level. If you have the ability to smite evil from another class, your cleric levels and levels in that class stack for the purpose of determining the extra damage dealt by your smite evil ability.

If you are a dragonborn (see Races of the Dragon), you can instead smite evil twice per day.

In addition, you add the following spells to your cleric spell list.