You turn your enemy into a conduit to an ice storm from the Elemental Chaos.

Encounter   ✦     Arcane, Cold, Evocation, Implement, Zone
Standard Action      Ranged 10

Target: One creature

Attack: Intelligence vs. Reflex

Hit: 2d8 + Intelligence modifier cold damage, and you create a zone of sudden cold in a burst 2 centered on the target until the end of your next turn. The zone moves with the target. The zone is difficult terrain, and any enemy that ends its turn in the zone takes 5 cold damage.

  Active Familiar: While your familiar is in the zone, it knocks prone any enemy that ends its turn in the zone.

Update (10/18/2011)
Updated in Wizard Schools article.

Published in Dragon Magazine 382, page(s) 26.