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Finish it
rogue attack 15

Requirement: wielding a light blade

Target: one bloodied creature

Attack: Dexterity vs. AC

Hit: "3[W] + Dexterity modifier damage, and ongoing 5 damage. The ongoing damage lasts until the creature is no longer bloodied."

Miss: "Half damage, and no ongoing damage."[MP:81]

Finish it is a daily power available to rogues at 15th level.