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Fire Shield is a Daily power available to Wizards at 6th level[AP:106]

Fire Shield
Wizard Utility 6

You are swathed in rippling flames that turn away both fire and chill but scorch anyone who strikes you.

Daily ✦ arcane, fire

Personal

Effect: You gain resist 10 cold and resist 10 fire until the end of the encounter. Whenever a creature makes a melee attack roll against you, it takes 2d6 + your Intelligence modifier fire damage. No creature can take this damage more than once per turn.