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Maiming strike
rogue attack 19

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

Target: one creature

Attack: Dexterity vs. AC

Hit: "4[W] + Dexterity modifier damage."

Effect: you knock the target prone. The target is slowed, cannot shift, and cannot charge (save ends all).[MP2:68]

Maiming strike is a daily power available to rogues at 19th level.