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Winter's wrath
wizard attack 7

area burst 2 within 10 squares

Target: each creature within the burst

Attack: Intelligence vs. Fortitude

Hit: 2d8 + Intelligence modifier cold damage.

Effect: The burst creates a zone that lasts until the end of the user's next turn, or until the user dismisses it as a minor action. The zone is lightly obscured. Any creature that ends its turn in the zone takes cold damage equal to the user's Intelligence modifier.

Winter's wrath is a 7th-level wizard encounter attack power. Each creature within its burst takes cold damage on a hit. In addition, whether winter's wrath hit any creatures or not, its burst creates a zone until the end of the user's next turn or until the user takes a minor action to dismiss it. The zone is lightly obscured squares, and it deals cold damage to creatures that end their turns within it.[PH:163][Dr401:60]

The "Class Compendium: The Arcanist" article in Dragon 401 added the evocation and zone keywords to winter's wrath. The article also modified the zone's effect from granting concealment to causing lightly obscured conditions, and changed the zone's timing from dealing damage to creatures that start their turns inside it to dealing damage to creatures that end their turns inside it. The December 2011 update finalized these changes.