Coldwing's Grasp (4e Power)

Coldwing's Grasp	Warmage Attack 3
A frozen hand covered in shards of ice and surrounded by mist bursts forth from your weapon and seeks out its target, freezing it in its grasp.
Encounter  Arcane, Cold, Implement
Standard Action	Ranged 15
Target: One creature
Attack: Intelligence Vs. Fortitude
Hit: 1d6+Intelligence modifier cold damage, and ongoing 3 cold damage (save ends).
Effect: Target is immobilized until the end of your next turn.