Rivulets of clinging liquid fire appear and cascade over your target. Anything that is flammable ignites at once and burns long after the streams of magic fire fade away.

Daily   ✦     Arcane, Fire, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Constitution vs. Reflex

Hit: 3d10 + Constitution modifier fire damage.

Effect: The target takes ongoing 5 fire damage (save ends).

Published in Player's Handbook, page(s) 133, Class Compendium.