Xuan Dao Asks About Longevity

In 2242 AD, a crack appeared in the sky. Demonic energy and spiritual energy swept across the earth. Ninety percent of the land was reduced to wasteland. Zombie aberrations were rampant. Humanity retreated to the steel fortress to survive. The collision and fusion of old-age technology and ancient immortality-cultivating runes have resulted in the emergence of psychic firearms, runic mechas, and genetic immortality-cultivating potions, forming an apocalyptic pattern of "spiritual energy as the root and technology as the use". As everyone knows, this planet has long been the "testing ground for immortality" for the extraterrestrial Celestial Clan. The struggle and evolution of all living beings are nothing more than the Celestial Clan's data analysis.