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Trickster's blade
rogue attack 3

Requirement: wielding crossbow, light blade, or sling

Target: one creature

Attack: Dexterity vs. AC

Hit: "2[W] + Dexterity modifier damage. Add your Charisma modifier to your AC until the start of your next turn."[PH:120]

Trickster's blade is an encounter power available to rogues at 3rd level.