Hydra Technique

The Hydra Technique is a secret, forbidden technique known by Ace Korimachi. After storing the required amount of chakra in his Noryokugan, Ace can activate this technique when needed. Once activated, this technique uses the immense chakra stored in his eye to restore his body to a previous state in his life. Shortly after activation, his body is restored to the life moment of his choosing. It not only restores his appearance, but his chakra level, chakra reserves jutsu activation period and even his jutsu cool down time. This theoretically allows Ace to use this technique over and over again if used wisely, as it resets this jutsu's cooldown time.

This jutsu was created after the Hydra. Scientist have no current way to determine a hydras age because they can revert their entire body back to a previous life stage.