Many Many centuries ago, Qi mysteriously appeared in all three thousand worlds. The plants and animals began to transform naturally, and were able to adapt to Qi. Only humans and other races were unable to adapt to the environment. They were not able to hunt. Many countries were obliterated by plants and monsters.
One day, immortals appeared on these planets from the upper realm. They taught people how to cultivate and they taught them how to make pills, talisman, formation, weapons.
Then they will select the best of the best in each category on each planet and send them to the upper world. After many years those immortals left. But the tradition remained. The immortal also left a spirit called CiCi. That spirit's responsibility is to visit each planet and find the best of the Random categories and send them to the upper world.