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Killer's retreat
rogue attack 23

Requirement: wielding a light blade.

Target: one creature

Attack: Dexterity vs. AC

Hit: "4[W] + Dexterity modifier damage, and if you were marked, you are no longer marked. You shift 2 squares."
Cunning Sneak: You instead shift a number of squares equal to 1 + your Intelligence modifier, and you can make a Stealth check to become hidden after the shift.[MP2:69]

Killer's retreat is an encounter power available to rogues at 23th level.