You Practice Martial Arts and I Sacrifice My Life. What Can You Do to Fight with Me?

This is a world where demons are rampant, and Wu Yuan traveled through to unlock the Kryptonian life training system. Kill demons, gain longevity, and practice martial arts endlessly, never ending. [Deducing the "Demon-Slaying Sword Technique", spending five hundred years of life, deducing the sword technique to the extreme, and obtaining the "Monster-Suppressing Zanpakutō"] [Deducing "Vajra Fist", spending one thousand years of life, deducing the boxing skills to the extreme, and obtaining "The Divine Elephant's Prison Suppressing Power"] [Deducing "Yakumo's Steps", spending five thousand years of life, deducing the footwork to the extreme, and obtaining "Shrinking Earth into an Inch"] The young man slashed his sword across the sky, causing countless demons and demons to have their livers and gallbladders split apart. Cut it off with one sword, creating a peaceful and prosperous age for the world. "That's not right. Why do I use more of my longevity energy?" Unknowingly, Wu Yuan discovered that he had become immortal!