Weapon of the Spirit (3.5e Maneuver)

Galeb slammed his warhammer down on the ogre's kneecap, only to have a ghostly duplicate follow the attack with another, cracking the kneecap in twain!

You summon a weapon identical to your own made of force, much like the spiritual weapon spell. The force weapon floats displaced off-center from you and mimics your motions. When you attack, it deals your weapon dice in force damage to your target (do not add strength or enhancement bonuses). Because it is force, it can strike incorporeal creatures normally even if your normal attack misses.

For example if your weapon is a rapier and normally deals 1d6+5, you gain an additional 1d6 force damage. If you confirm a critical and deal 2d6+10, the spiritual weapon deals 2d6. If you miss, it misses. The force weapon remains for 1 round before vanishing.

This is a supernatural maneuver.