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Hounding strike
rogue attack 17

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

Target: one creature

Attack: Dexterity vs. Will

Hit: "3[W] + Dexterity modifier damage. Until the end of your next turn, you gain combat advantage against the target and a +1 power bonus to all defenses against its attacks."
Artful Dodger: The power bonus is equal to your Charisma modifier.[PH:124]

Hounding strike is an encounter power available to rogues at 17th level.