Sacred Vengeance

(Complete Warrior, page 108, DnD 3.5)

[Divine]

You can channel energy to deal extra damage against undead in melee.

Prerequisite

Turn or rebuke undead ability

Benefit

As a free action, spend one of your turn undead attempts to add 2d6 points of damage to all your successful melee attacks against undead until the end of the current round.