Humans, demons, demons, and spirits coexist. The core of cultivation is "alchemy." The pills are divided into five categories: "ordinary, spiritual, precious, immortal, and divine." However, high-level elixirs require "living creatures as a guide", and the four tribes have fought for this for thousands of years. However, the legendary "No-Yin Pill" does not require living creatures, but it has been lost long ago.
