The Soul Divergence Incantation allowed one to cultivate an undying soul. Once that soul appeared, the cycle of reincarnation in Heaven and Earth could not destroy it. Even if you died, your flesh and blood would be reborn years later.
It was not one of the three thousand great Daos of the ancient Demon Immortal Sect, but rather, something that Ke Yunhai had acquired by chance and taken to be a priceless treasure. Because he could not cultivate it successfully, he passed it on to Ke Jiusi.
However, it was too difficult for Ke Jiusi, despite his incredible latent talent. He could not acquire full enlightenment; in the end it had required the precious treasure that Ke Yunhai had forged before his death, coupled with the vast changes Ke Jiusu experienced, in order to comprehend it and form an undying soul that the cycle of reincarnation could not destroy.
