You create a vertical column of golden flames that burns all within.

At-Will   ✦     Arcane, Evocation, Fire, Implement
Standard Action      Area burst 1 within 10 squares

Target: Each creature in the burst

Attack: Intelligence vs. Reflex

Hit: 1d6 + Intelligence modifier fire damage.
    Level 21: 2d6 + Intelligence modifier fire damage.

Update (1/24/2012)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 159, Class Compendium.