Divine Might( Deities and Demigods, p. 50)
The deity can channel energy to increase its damage in combat.
Power Attack (PH) , CHA 13, STR 13, Ability to turn or rebuke undead,
The deity can spend one of its turn/rebuke undead attempts to add its Charisma modifier to its weapon damage for a number of rounds equal to its Charisma modifier. This is a supernatural ability.