Cold slams into your foe, leaving a whirling storm of frost lingering around it.

Daily   ✦     Arcane, Cold, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Charisma vs. Fortitude

Hit: 5d8 + Charisma modifier cold damage.

Effect: Until the end of the encounter, wherever the target moves, each square adjacent to it is difficult terrain for your enemies.

Published in Player's Handbook 2, page(s) 143.