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Powerful shot
rogue attack 13

Requirement: wielding a crossbow, a light thrown weapon, or a sling.

Target: one creature

Attack: Dexterity vs. AC

Hit: "3[W] + Dexterity modifier damage, you push the target 1 square, and the target is slowed until the end of your next turn."[MP:80]

Powerful shot is an encounter power available to rogues at 13th level.