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Wicked reminder
rogue attack 13

Requirement: wielding a crossbow, a light blade, or a sling.

Target: one creature

Attack: Dexterity vs. AC
Ruthless Ruffian: If the target is already suffering the effect of the rattling keyword, this attack targets Reflex instead of AC.

Hit: "1[W] + Dexterity modifier damage."

Effect: The target gains vulnerability to weapon attacks equal to your Strength modifier until the end of your next turn.[MP2:66]

Wicked reminder is an encounter power available to rogues at 13th level.