Radiant Shield
Swordmage Attack 23
Arcane radiance bursts around your foes, searing them while transforming your allies into insubstantial creatures of light.
Area burst 2 within 10 squares
Target: Each enemy in burst
Attack: Intelligence vs. Will
Hit: 3d8 + Intelligence modifier radiant damage, and the target is marked until the end of your next turn.
Aegis of Shielding: the target is instead marked by your aegis of shielding until the end of your next turn. marking the target does not remove the mark on another target already affected by your aegis of shielding.
Effect: Each ally in the burst becomes insubstantial until the end of your next turn.
Radiant Shield is an encounter power available to swordmages at the 23rd level.[AP:61]