You mount a storm of bitterly cold hailstones that pummels a wide swath of ground and covers the area in ice.

Daily   ✦     Arcane, Cold, Evocation, Implement, Zone
Standard Action      Area burst 5 within 20 squares

Target: Each creature in the burst

Attack: Intelligence vs. Fortitude

Hit: 4d8 + Intelligence modifier cold damage, and the target is immobilized (save ends).

Miss: Half damage, and the target is slowed (save ends).

Effect: The burst creates a zone of difficult terrain that lasts until the end of the encounter.

Update (1/25/2012)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 168, Class Compendium.