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Easy target
rogue attack 1

Requirement: wielding crossbow, light blade, or sling

Target: one creature

Attack: Dexterity vs. AC

Hit: "2[W] + Dexterity modifier damage, and the target is slowed and grants combat advantage to you (save ends both)."

Miss: "Half damage, and the target grants combat advantage to you until the end of your next turn."[PH:119]

Easy target is a daily power available to rogues at 1st level.