Torch Undead (3.5e Feat)
From D&D Wiki
Torch Undead [Divine]
You can burn undead in an outbreak of holy flames.
Benefit: You can spend one of your daily turn or rebuke undead attempts to shoot out holy flames in a 60 foot cone. All Undead in the area are set on fire. They suffer 1d4 Per 5 levels + Charisma-bonus fire damage each round for a number of rounds equal to half your cleric level along with 1d6 per 2 lvls initial damage.