This secret place used to be the residence of a powerful sect. When they flourished, it was because of the spirit of rainbow in Shengling mountain that killed all the disciples of the sect, or fled and never came back. As soon as such a huge foundation was destroyed, the past also disappeared in history.

if it wasn't for the fact that the spirit of the rainbow was badly damaged and fell into a deep sleep, I'm afraid there would have been no living beings in the whole secret world.

later, after Qingtian dragon Python got rid of the congenital restriction, he limited the spirit of rainbow to Shengling mountain,...