Starting with Immortality, I Grind My Proficiency

After transmigrating, Lu Yuan gains an immortal body. But in a world overrun by demons and monsters, where immortals and gods reign supreme, immortality is the greatest curse of all. To avoid being treated like Tang Monk’s flesh, and to find some amusement in an endless stretch of years, he decides to grind every skill to the maximum level! Ten thousand years later, when a cataclysm strikes and the immortals and gods fall, he swings his sword and only then realizes he has long since become invincible.