You attack twice, causing your foes to stagger backward.

Encounter   ✦     Martial, Weapon
Standard Action      Melee or Ranged weapon

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

Targets: One or two creatures

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

Hit: 1[W] + Strength modifier damage (melee) or 1[W] + Dexterity modifier damage (ranged) per attack. With each hit, you push the target 1 square. If both attacks hit the same target, you push the target a number of squares equal to 1 + your Wisdom modifier.

Published in Player's Handbook, page(s) 107.