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Dazing shot
rogue attack 17

Requirement: wielding a sling.

Target: one creature

Attack: Dexterity vs. Fortitude

Hit: "2[W] + Dexterity modifier damage, and the target is dazed until the end of its next turn."
Cunning Sneak: If the target moves or attacks before the end of its next turn, it falls prone at the end of that action.[MP2:66]

Dazing shot is an encounter power available to rogues at 17th level.