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Silverlight Strike
Swordmage Attack 13

Your strike causes silver light to flare around your foe, obscuring its ability to perceive anyone but you.

Melee weapon

Target: One creature

Attack: Intelligence vs. AC

Hit: 1[W] + Intelligence modifier radiant damage. Until the end of your next turn, all your allies are invisible to the target.
Aegis of Shielding: The attack deals extra damage equal to your Constitution modifier.

Silverlight Strike is an encounter power available to swordmages at the 13th level.[AP:58]