Dungeons & Dragons 3.5 Feat: Smite

: Once per day, a paladin may attempt to smite
evil with one normal melee attack. She adds her Charisma bonus (if
any) to her attack roll and deals 1 extra point of damage per paladin
level. For example, a 13th-level paladin armed with a longsword
would deal 1d8+13 points of damage, plus any additional bonuses for
high Strength or magical affects that would normally apply. If the
paladin accidentally smites a creature that is not evil, the smite has
no effect, but the ability is still used up for that day.
At 5th level, and at every five levels thereafter, the paladin may
smite evil one additional time per day, as indicated on Table 3–12:
The Paladin, to a maximum of five times per day at 20th level.

1 time per day

 

+Chr to attack
+1 damage per paladin lvl