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Opening move
rogue attack 1

Requirement: wielding a light blade

Target: one creature

Attack: Dexterity vs. AC

Hit: "2[W] + Dexterity modifier damage."

Effect: "You gain a power bonus to AC and Reflex equal to your Charisma modifier until the end of your next turn.
"Artful Dodger: The defense bonus equals 2 + your Charisma modifier."[Dr381:68]

Opening move is an encounter power available to rogues at 1st level.

Opening move was introduced in "Class Acts: The Duelist Rogue" by Mike Mearls in Dragon #381.