D&D4 Wiki
Swift parry
rogue utility 6

Prerequisite: wielding a light blade.

Trigger: You are hit by a melee attack

Effect: "You gain a bonus to defenses against the attack equal to your Charisma modifier, and you gain combat advantage against the triggering attacker until the end of your next turn."[Dr381:69][HotFL:183]

Swift parry is an encounter power available to rogues at 6th level.