No one knows what the Reincarnation that happens every three thousand years means or what exactly will happen.
Buddha spoke of the Three Thousand Great Worlds; thus, every world experiences reincarnation once every three thousand years. This is but a legend, yet it's a well-reasoned one. Like a deep nightmare, it entwines itself around the minds of the people, making everyone who hears this tale deeply anxious and uneasy.
Just look at the Xuanyuan Nation.
Three thousand years ago, the last human emperor, also known as the "First Emperor" by posterity, almost single-handedly killed tens of thousands of cultivation practitioners and burned nearly one million books. He destroyed a crucial part of the legacy of the cultivation practitioners, resulting in the Martial Dao being stuck at a bottleneck for the entire subsequent three thousand years.
