Flameheart Rage is a daily power available to Barbarians at 15th level.[PH2:56]
Flameheart Rage
Barbarian Attack 15
The spirit of the red dragon imbues your attacks with fiery wrath, scorching your foe. As you rage, the fire of the dragon's heart lashes out at those that strike you.
Close burst 1
Target: each enemy in burst
Attack: Strength vs AC
Hit: 2[W] +Strength modifier fire damage and the target takes ongoing 5 fire damage (save ends).
Miss: Half damage.
Effect: You enter the rage of the red dragon. Until the rage ends, any creature that hits you with a melee attack takes fire damage equal to 5 + you Constitution modifier