Conflagration Breath

Epic Tier
Prerequisite: 21st level, dragonborn, dragon breath racial power that deals fire damage, Burning Breath feat
Benefit: When you use your dragon breath, you can choose to make its area a zone that lasts until the end of your next turn. Each creature that starts its turn in the zone or enters the zone takes 10 fire damage.

Published in Player's Handbook Races: Dragonborn, page(s) 25.