Your skill with your weapon is so great that every thrust, parry, and counterattack takes its toll on your foes. Some of your attacks are so ingrained within you that they require almost no effort.

Daily   ✦     Martial, Stance, Weapon
Minor Action      Personal

Effect: You assume the force the battle stance. Until the stance ends, your fighter at-will and encounter weapon attack powers deal 1[W] extra damage. In addition, once per round when an enemy starts its turn adjacent to you, you can use a fighter at-will attack power against it as a free action, but only if you are able to make opportunity attacks.

Published in Player's Handbook, page(s) 86, Class Compendium.