Negative Energy Burst( Complete Divine, p. 90)
You can use your rebuke/ command undead ability to unleash a burst of negative energy.
CHA 25, ability to rebuke or command undead, able to cast infl ict critical wounds, any evil alignment,
You can use one rebuke or command undead attempt to unleash a wave of negative energy in a 60-footburst. Roll a normal rebuke (or command) check, except that the negative energy burst affects living creatures rather than undead. Any creature that would be rebuked by this result gains one negative level. Any creature that would be commanded by this check gains two negative levels. The Fortitude save DC to remove these levels 24 hours later is equal to 10 + 1/2 your effective turning level + your Charisma modifier.