You align your spell with those you wove over your ally's armor, causing them to radiate an unnatural cold.

At-Will   ✦     Arcane, Cold, Implement
Standard Action      Area burst 1 centered on an ally within 5 squares

Target: One enemy in the burst

Attack: Intelligence vs. Reflex

Hit: 1d8 + Intelligence modifier cold damage. Until the end of your next turn, any enemy that hits the ally takes cold damage equal to your Wisdom modifier.
Level 21: 2d8 + Intelligence modifier cold damage.

Published in Dragon Magazine 381, page(s) 56.