Arcane Tempest (4e Power)

Arcane Tempest	Warmage Attack 25
A great blast echoes from one of your Mystic Orbs as it explodes into a thousand pulsating arcane shards that swiftly strike into the ground, emanating pure destructive force.
Daily  Arcane, Force, Implement, Zone
Standard Action	Area burst 5 within 15 squares
Target: Each creature in burst
Attack: Intelligence Vs. Reflex
Hit: 5d8 + Intelligence modifier force damage and the target is dazed (save ends).
Effect: The burst creates a shard-filled arcane zone until the end of the encounter or for 5 minutes. The zone is difficult terrain. Any creature in the zone at the start of its turn takes 4d6 force damage. Any creature that ends its move in the arcane zone is dazed (save ends).
Special: The Mystic Orb used for this power is destroyed.