Yes, we've all been dying to see what it is. It is very cool, though it's practicality has yet to be determined.

Galaxia Darkness. Basically, he swings his cape and anyone hit with it is sucked into a vortex of darkness. Then, with a flash of dazzling light, he slices through you like butter. Very cool, just like the character.

Unfortunately, there are two downsides. One, anyone, even an ally, will be sucked into the vortex and damaged. So be wary when using it in team battles. Two, it's range is very limited, so you had better be accurate with it. It would be a real shame to waste a Smash Ball.