Several thousand years ago, a dragon was captured by a human cultivator. The cultivator conducted multiple experiments on this superior race to uncover the secrets its body hid.
The experiments did not yield very satisfying results, but he did create a unique technique by studying the Cycle of Rebirth of dragons. It was a method that could regenerate any mortal injury or wound, returning the skin to its original state. However, the pain that accompanied this process was more than an ordinary person could bear. Moreover, the method only worked on beasts, since dragons were also beasts.
He named this technique The Complete Rejuvenation.
Of course, he was found and killed by the dragons, while his entire clan was turned into slaves. The Complete Rejuvenation technique was placed in the forbidden library of the Éclair Clan, access to which was granted only to the clan's highest authority.
