Those who descend from the heavens privately.
Li Yan had heard of this before.
It had happened in history, those fairies descending, divine beings descending, many stories were mixed with truth and lies, perhaps there were real prototypes.
But "Heavenly Rules" are stricter than "Yin Law".
Once you descend without permission, you will suffer the Five Thunders Bombardment.
So the endings of stories about immortals yearning for the Lower Realm are usually not good.
Therefore, those descending privately are far less than the Yin criminals returning to life.
Of course, there are other reasons for descending.
Like the Battle of God Sealing, Zhou rites replaced Shang sacrifices, many immortals descended, the Seventy-two Demon Gods were sealed, human sacrificial rites changed.
