You create a fence of sharp frost-needles around your foe. They slowly freeze him, and if he moves or touches them, they grow longer and sharper.

Daily   ✦     Arcane, Cold, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Charisma vs. Reflex

Hit: 3d8 + Charisma modifier cold damage.

Effect: The first time the target moves on each of its turns it takes 1d8 cold damage (save ends). Until the effect ends, you can use a minor action once per round, starting on your next turn, to deal 10 cold damage to the target.

Update (8/12/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 135, Class Compendium.