Black Bladestorm Wave (3.5e Maneuver)

Your body seems to fall apart into a thousand slicing black blades

As part of a move action you transform yourself into a swarm of swirling blade blades. You gain the benefits of a Fine sized swarm while you are moving, including being able to pass through small cracks and being immune to weapon damage (and vulnerable to Area of Effect damage). Creatures you pass over take 8d6 points of magic adamantine slashing damage, and must make a Fortitude save or be rendered nauseated from the pain for 1 round. Creatures only take damage (and make saves) once each round no matter now many times you pass over them. Creatures immune to pain (such as most constructs and undead) are immune to the secondary effect. You return to your normal state once you stop moving.

This is a supernatural maneuver.