Divine Might
( Defenders of the Faith: A Guidebook to Clerics and Paladins, p. 19)[Divine]
You can channel energy to increase the damage you deal in combat.
Prerequisite
Power Attack (PH) , Ability to turn or rebuke undead, CHA 13+, STR 13+,
Benefit
Spend one of your turn/rebuke undead attempts to add your Charisma bonus to your weapon damage for a number of rounds equal to your Charisma bonus.