Rise of the Weakest Martial Artist Immortal

Ren regressed in his past life after dying from the attacks of the Immortals vying for his Technique scrolls. They wanted to steal his knowledge and become the greatest in the land of Immortals. Luckily, Ren knew the secret to Rebirth and that made him to get his soul to fuse with the academy of Immortals' weakest disciple. He managed to be one with him in body and mind. He then promised that he would take his revenge and get back to where he came from. The highest realm of Immortals. He first fixed his core and then with his knowledge of his past life, the vast Knowledge of Libraries of All Martial Arts and Techniques, he then made his comeback and take his revenge on them all!