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Aegis of ensnarement
swordmage feature

Target: one creature within the power's area of effect

Effect: "You mark the target. The target remains marked until you use this power against another target. If you mark another creature using other powers, the target is still marked.

"Until the mark ends, if the target makes any attack that does not include you as a target, it takes a −2 penalty to the attack roll.

"If a target marked by this power is within 10 squares of you when it hits with an attack that does not include you as a target, you can use an immediate reaction after the target's entire attack is resolved to teleport the target to any space adjacent to you. In addition, the target grants combat advantage to all creatures until the end of your next turn. If no unoccupied space exists adjacent to you, you can't use this immediate reaction, and the target doesn't grant combat advantage as a result of this effect."[AP:50]

Aegis of ensnarement is an at-will power available to swordmages with the Swordmage Aegis class feature. A swordmage selects either aegis of assault, aegis of ensnarement, or aegis of shielding as the benefit for Swordmage Aegis.