You channel the force of the northern wastes into a blast of freezing wind.

Encounter   ✦     Cold, Implement, Primal
Standard Action      Close blast 5

Target: Each creature in the blast

Attack: Wisdom vs. Reflex

Hit: 3d8 + Wisdom modifier cold damage, and the target is immobilized until the end of your next turn.

  Primal Guardian: Until the end of your next turn, the target also gains vulnerability to all damage equal to your Constitution modifier.

Published in Player's Handbook 2, page(s) 95.