Looking for a Sword to Kill the Immortal

Immortals are unkind and regard all things as stupid dogs. The saint is unkind and treats the common people as stupid dogs. Mountains and rivers are broken, and the world is in danger. I, Ling Ling, regain my divine weapon and destroy the saints and immortals. The story of a killer traveling through the world of immortal cultivation, looking for Xuanyuan Sword fragments in order to survive, growing up along the way, gathering the luck of heaven and earth, and finally killing the immortal.