Constrictor's Strike
Swordmage Attack 29
You exhibit your mastery of the battlefield as you harry your foe and control its movements, making it unable to escape your blade.
Melee weapon
Target: One creature
Attack: Intelligence vs. AC
Hit: 4[W] + Intelligence modifier damage
Miss: Half damage
Effect: The target is immobilized (save ends). Until the end of the encounter, whenever you hit the target with a melee attack, it is immobilized until the end of your next turn.
Aegis of Ensnarement: The target is restrained instead of immobilized.
Constrictor's Strike is a daily power available to swordmages at the 29th level.[AP:63]