Wuxia Crossover: From the Start, I Merged With a Sword Immortal and Slew Buchi

He transmigrates into a world of mixed martial arts and, as a disciple of the Demonic Sect, is hunted by his enemies from the start and nearly killed. At the brink of death, the System arrives at its leisure and passes on the cultivation of a Sword Immortal. One sword strike shakes the world. From then on, he commands the Demonic Sect and subdues the martial world, carving out a path above all others in this world of heroes and rising powers.