Divine Might

(Defenders of the Faith: A Guidebook to Clerics and Paladins, page 19, DnD 3.0)

[Divine]

You can channel energy to increase the damage you deal in combat.

Prerequisite

Power Attack, 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.