A final lunge brings you into an advantageous position.

At-Will   ✦     Martial, Weapon
Standard Action      Melee or Ranged weapon

Requirement: You must be wielding a crossbow, a light blade, or a sling.

Effect: Before the attack, you can move up to 2 squares.

Target: One creature

Attack: Dexterity vs. AC

Hit: 1[W] + Dexterity modifier damage.
    Level 21: 2[W] + Dexterity modifier damage.

Update (9/30/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 118, Class Compendium.