You have mastered the Bakumatsu period's deadliest sword art, Hiten Mitsurugi-ryū, on a level equivalent to Hiko Senjūro XIII.
Described as a "sword style for supermen," the foundation of this technique is it's unbelievable speed, which cannot be seen with the naked eye. It requires extreme athleticism to wield properly, destroying the bodies of those too weak to properly wield it. You will not have this problem, as your body becomes athletic enough to handle even the most dangerous techniques.
It comes with a limited combat precognition that relies on using your ki to "read" your enemies.
It also somehow keeps it's practitioners unnaturally young, with Himura Kenshin, who hadn't even properly mastered the style, looking like he did at 15 even at the age of 33.