C487 Cultivate Core Upanishads

In this world, pure spirit energy was hard to find, but Yin Fiend Qi were easier.

The so called Yin Fiend Qi was some dark and murky Qi. It was even the resentful Qi that came from humans and remained silent in the nine hells.

As the sun and moon alternated and time flowed, these Yin Fiend Qi would gradually appear as an ideology