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Profit from weakness
rogue attack 9

Requirement: wielding a light blade

Trigger: an enemy adjacent to you hits you with a melee attack effect: you gain a +4 bonus to all defenses against the attack. The triggering enemy grants combat advantage to you until the end of your next turn.

Target: the triggering enemy

Attack: Dexterity vs. Reflex

Hit: "2[W] + Dexterity modifier damage."

Miss: "Half damage."

Effect: you knock the target prone.[MP2:64]

Profit from weakness is a daily power available to rogues at 9th level.