From Compendium of Worldly Lore
Needs review
Source: Complete Divine
Description: You automatically turn (or even destroy) lesser undead.
Prerequisites: Epic Level, Dispel Evil, Turn Undead
Every undead creature that comes within 15 feet of you is automatically affected as if you had turned it. This doesn't cost a turning attempt, and you don't have to roll turning damage (it automatically affects all undead in a 15-foot burst), but it only turns undead with Hit Dice equal to or less than your effective cleric level minus 10 (and automatically destroys undead with Hit Dice equal to or less than your effective cleric level minus 20). For example, a 22nd-level cleric would automatically turn any nearby wights or wraiths and would automatically destroy any Medium skeletons or zombies that came near him, but would have to turn nightshades and the like normally. Just as with normal turning, you can't affect undead that have total cover relative to you.