"The Classic of Mountains and Seas" is not a myth. It is a sealed book.
In ancient times, the world of mountains and seas was separated from reality due to a disaster called "The Great Dream Collapse". The ancestors sealed the fragments of the broken mountains and seas into books. From then on, a keeper of the scriptures in each generation must enter the dream to repair the seals, otherwise disasters from the mountains and seas will pour into the world.
But there is a rule in the Classic of Mountains and Seas that has never been stated clearly - no matter how much power you gain, you will lose something equally important.
