"Envoys" such as Yun Qin went to the human world to deal with this portion of evil energy that was not affected by the divine axiom, allowing souls with strong wills to return to the cycle of reincarnation.
Only those who possessed the powers of life and death could cross over between the two realms.
However, their power was not limited to absorbing evil energy. For example, Yun Qin used it to break the soul-capturing array formation and save the hidden ghost elder.
Therefore, there would always be greedy and audacious people who set their eyes on this piece of juicy meat.
The book recorded that thousands of years ago, ordinary people discovered the existence of Hades' envoys. Even though these envoys were powerful, they still had weaknesses, so some got their powers stolen. Their stolen power was then transformed into power that many mortals could not even imagine.