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Walking wounded
rogue attack 5

Requirement: wielding crossbow, light blade, or sling

Target: one creature

Attack: Dexterity vs. Fortitude

Hit: "2[W] + Dexterity modifier damage, and the target is knocked prone. Until the end of the encounter, if the target moves more than half its speed in a single action, it falls prone at the end of its movement."

Miss: "Half damage, and the target is not knocked prone."[PH:120]

Walking wounded is a daily power available to rogues at 5th level.