First and final strike
rogue attack 27
Melee weapon
Requirement: wielding a light blade.
Effect: You can shift your speed before making the following attack and can move through enemies’ spaces. You gain a power bonus to AC equal to your Charisma modifier until the end of your next turn.
Artful Dodger: The AC bonus instead equals 2 + your Charisma modifier.
Target: one creature
Attack: Dexterity vs. Reflex
Hit: "4[W] + Dexterity modifier damage, or 5[W] + Dexterity modifier damage if the target has not yet acted in combat."[Dr381:70]
First and final strike is an encounter power available to rogues at 27th level.