Hunter's Pursuit
Swordmage Attack 15
You gauge your opponent's moves, attacking where the creature is weakest and cutting off its ability to escape.
Melee weapon
Target: One creature
Attack: Intelligence vs. Reflex
Hit: 3[W] + Intelligence modifier damage, and the target is immobilized until the end of your next turn.
Effect: Until the end of the encounter, whenever you it the target with a melee attack, it is immobilized until the end of your next turn.
Aegis of Ensnarement: Until the end of the encounter, whenever you hit the target with a melee attack, you can knock it prone instead of immobilizing it.
Hunger's Pursuit is a daily power available to swordmages at the 15th level.[AP:58]