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Sheathe the blade
rogue attack 27

Requirement: wielding a light blade.

Target: one creature

Attack: Dexterity vs. AC

Hit: "3[W] + Dexterity modifier damage, and you push the target 1 square. The target gains vulnerable 10 to all damage until the start of your next turn."[MP2:71]

Sheathe the blade is an encounter power available to rogues at 27th level.