Invigorating

This special ability can only be placed on melee weapons. After an attack with this weapon drops a living foe (kills it or drops it to negative hit points), the weapon infuses its wielder with vigor. If its wielder is fatigued, the weapon removes the fatigue. If exhausted, the wielder becomes fatigued instead. If neither exhausted nor fatigued, the wielder gains a +2 morale bonus on attack rolls and a +10 foot enhancement bonus to all modes of movement possessed until the end of the wielder's next turn.