Kokutou Yoru

The Black Sword Kokutou Yoru, the strongest Sword which wielded by the strongest swordman in One Piece world (because the most strongest sword is Masamune and the coolest Swordmaster in the world is Sephiroth^_^)It's an ornately decorated, man-sized (6 feet) sword shaped like a cross with a shiny black blade, which is curved at the end. It also seems to generate otherworldly purple streaks as it slices, as seen when he cut down Zoro and when he split Don Krieg's ship in half. Yet as well as having the ability to use it to slice up entire fleets of ships, he is graceful with the blade enough to knock bullets and change their course with little effort.

The cross pendant worn on his neck is actually a small dagger. Though it appears to have no value, in the hands of Mihawk, it was able to defeat Zoro with the slightest bit of pressure, and was able to stab close to his heart.

He's able to attack enemies with powerful slashes made of a huge stream of energy or compressed air (it's unknown yet) like they were giant projectiles, like Zoro's Pound Hou techniques or the different variations of Rokushiki's Rankyaku.