Empower Turning( Defenders of the Faith: A Guidebook to Clerics and Paladins, p. 20)
You can turn or rebuke more undead with a single turning attempt.
Extra Turning (PH) , Ability to turn or rebuke undead, Charisma 13+,
You can turn or rebuke more undead than usual, but have a harder time affecting undead with a larger number of Hit Dice. If you take a -2 penalty on your turning check roll, you can add +2d6 to your turning damage roll.