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Shimmering blade
rogue attack 23

Requirement: wielding a light blade.

Effect: You gain a power bonus to AC and Reflex equal to your Charisma modifier until the end of your next turn. Until the end of your next turn, you can use the following attack.
Artful Dodger: The defense bonus equals 2 + your Charisma modifier.
Opportunity Action Melee weapon

Trigger: An enemy makes a melee attack against you, starts its turn adjacent to you, or ends its turn adjacent to you

Target: the triggering enemy

Attack: Dexterity vs. Reflex

Hit: "2[W] + Dexterity modifier damage."[Dr381:70]

Shimmering blade is an encounter power available to rogues at 23th level.