Energy Theft
Swordmage Attack 5
You draw on your enemy's natural resilience to protect your allies from harm.
Melee weapon
Target: One creature
Attack: Intelligence vs AC
Hit: 1[W] + Intelligence modifier damage
Effect: Choose acid, cold, fire, force, lightning, necrotic, poison, psychic, radiant, or thunder. The target gains vulnerable 5 to that damage type (save ends.) Each ally within 5 squares of you gains resist 5 to that damage type until the end of the encounter.
Energy theft is a daily power available to swordmages at 5th level.[AP:54]