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Kiss of death
rogue attack 29

Requirement: wielding a light blade.

Effect: Choose one creature adjacent to you. Until the stance ends, whenever the chosen creature is adjacent to you and takes damage from a melee or a ranged attack while you are Wielding a light blade, you can make a melee basic attack against it as a free action. In addition, your basic attacks against the target gain the rattling keyword.[MP:71]

Kiss of death is a daily power available to rogues at 29th level.