Frost and Snow Queen

In the era of "memory civilization", the starting point of the ninth-level civilization, there is a core law: "To exist is to be remembered." Once forgotten, existence falls into nothingness. Unable to bear the pain of memory, 37.2 Billion existences chose to forget, turned into nothingness civilization, and slept in the rift across the universe. They did not disappear, but waited in absolute darkness for half a million years.