Smite Heretic

(Book of Exalted Deeds, DnD 3.5)

Conjuration

Level: ; Paladin 3
Components: V, S
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 minutes/level

For the duration of the spell, when using your smite evil class ability against an evil creature with the ability to cast divine spells, you gain a +2 sacred bonus on the attack roll.
Furthermore, the attack deals 2 extra points of damage (instead of 1) per paladin level.