Clerics of the Silver Flame devised this spell to dispose of Karrnathi undead legions, since turning them was seldom enough.

Casting this spell is a bonus action. If you cast the spell before attempting to turn undead, your turn undead ability changes as follows: Instead of being turned or destroyed, all undead within 30 feet take 6d6 points of fire damage. A successful Con save reduces the damage by half. Undead creatures destroyed by the damage are utterly consumed in silvery fire, leaving nothing behind except their possessions.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.