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Shield of the Besieged Tower
Swordmage Utility 16

The more foes stand arrayed against you, the stronger your defensive magic is.


Effect: Until the stance ends, you gain a +1 power bonus to AC. If at least two enemies are within 3 squares of you, this bonus increases to +3.

Shield of the Besieged Tower is a daily power available to swordmages at the 16th level.[AP:59]