In a Time of Chaos and Chaos, I Am Determined to Kill the Demons.

Travel to the chaotic world of Yaowu and obtain the creation system. But he never expected that using the system would actually require lifespan... He thought he was a loser until he discovered that demon slayers could absorb their longevity. As a result, the monsters of the Great Xia Dynasty ushered in an unprecedented catastrophe. [You killed the Earth-shattering Bear Demon and gained 229 years of life] [You killed the proud eagle monster and gained 369 years of life] [You killed the nine-tailed demon fox and obtained... Do you think you can keep this? ...