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Spring the trap
rogue attack 7

Requirement: wielding a light blade

Target: each enemy in burst you can see

Attack: Dexterity vs. AC

Hit: "1[W] + Dexterity modifier damage, and you can shift 1 square.
Ruthless Ruffian: This power gains the rattling keyword."[MP:78]

Spring the trap is an encounter power available to rogues at 7th level.