Stinging squall
rogue attack 17
Requirement: wielding a light blade.
Target: each enemy in burst you can see
Attack: Dexterity vs. AC
Hit: "1[W] + Dexterity modifier damage, and the target is weakened when making attacks against you until the end of your next turn."
Ruthless Ruffian: The attack deals extra damage equal to your Charisma modifier, and the target is weakened when making any attack (not just against you).[MP:83]
Stinging squall is an encounter power available to rogues at 17th level.