Destiny Gate
When the Tomb Tower of the Legendary Beasts appeared or who created it, it could not be said because it was longer than human history had been written. But ancient history researchers had hypothesized that the four Tomb Tower of the Legendary Beasts, which spread over the four continents, should have occurred in the ancient times when the beasts occupied the human world. The exploration in ancient places indicated the same direction.
The time from the past to the present of the human world was divided into two eras: the ancient era and the founding of the historical era. The ancient era was the time beyond ten thousand years ago. Since it was a time when nothing had been written, the era was formed based on historical evidence from ancient places, discovered, and put together to make hypotheses by scholars who studied history in detail.