Elemental Aegis
Swordmage Utility 2
You raise an aegis in your ally's defense, infusing the shield with elemental energy to help defend against certain attacks.
Close burst 10
Trigger: An enemy you have marked attacks an ally
Target: One ally in burst
Effect: Choose a damage type: acid, cold, fire, lightning, or thunder. Your ally gains resistance to that damage type equal to 5 + your Constitution modifier until the end of your next turn.
Elemental Aegis is a daily power available to swordmages at the 2nd level.[Dr367:56]