You attack twice while maneuvering yourself into the most advantageous position possible.

Encounter   ✦     Martial, Weapon
Standard Action      Melee or Ranged weapon

Requirement: You must be wielding two melee weapons or a ranged weapon.

Target: One or two creatures

Attack: Strength vs. AC (melee; main weapon and off-hand weapon) or Dexterity vs. AC (ranged), two attacks

Special: After the first or the second attack, you can shift a number of squares equal to 1 + your Wisdom modifier.

Hit: 1[W] + Strength modifier damage (melee) or 1[W] + Dexterity modifier damage (ranged) per attack.

Published in Player's Handbook, page(s) 106.