You coat the ground with a treacherous patch of ice that freezes and hampers your foes.

Encounter   ✦     Arcane, Cold, Evocation, Implement, Zone
Standard Action      Area burst 1 within 10 squares

Target: Each creature in the burst

Attack: Intelligence vs. Reflex

Hit: 1d6 + Intelligence modifier cold damage, and the target falls prone.

Effect: The burst creates a zone that lasts until the end of your next turn or until you end it as a minor action. The ground of the zone is difficult terrain.

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

Published in Player's Handbook, page(s) 160, Class Compendium.