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Duelist's flurry
rogue attack 1

Requirement: wielding a light blade

Target: one creature

Attack: Dexterity vs. AC

Hit: "Dexterity modifier damage, slide the target 1 square, and you shift 1 square. You can deal sneak attack damage even if you do not have combat advantage with this attack.
"Level 21: 5 + Dexterity modifier damage."[Dr381:68]

Duelist's flurry is an at-will power available to rogues at 1st level.

Duelist's flurry was introduced in "Class Acts: The Duelist Rogue" by Mike Mearls in Dragon #381.