Acrid orange fumes hiss up from beneath the ground, and then suddenly ignite in a thundering detonation. Any creature in the area is burned by the searing flames.

Daily   ✦     Arcane, Fire, Implement
Standard Action      Area burst 1 within 10 squares

Target: Each creature in burst

Attack: Constitution vs. Reflex

Hit: 2d10 + Constitution modifier fire damage.

Effect: The targets take ongoing 5 fire damage (save ends).

Published in Player's Handbook, page(s) 134, Class Compendium.