Zone of Frost (4e Power)

Zone of Frost	Warmage Attack 1
You destroy one of your Mystic Orbs with a ray of frost, launching shards of ice into the air and leaving behind a fine mist of snow and ice, covering the area.
Daily  Arcane, Cold, Implement
Standard Action	Area burst 4 within 15 squares
Target: Each creature in burst.
Attack: Intelligence Vs. Reflex
Hit: 1d8+Intelligence modifier cold damage and the target is knocked prone.
Miss: Half damage.
Effect: A fine mist and layer of ice cover the area of effect until the end of your next turn. Any creature entering the area or starting its turn within the area is subject to another attack. You can dismiss the cloud as a minor action.
Sustain Minor: The effect persists.
Special: The Mystic Orb used for this power is destroyed.