This world had experienced astonishing historical changes. With the "Great Annihilation" as a midpoint, the entire world—even fundamental principles—underwent a momentous upheaval, such that the era of the deep sea after the Great Annihilation and the Order Era before it could almost be considered two entirely different "worlds."
But even so, there were still people who persistently organized the historical materials passed down since the Great Annihilation, attempting to extract the true appearance of history from the fragmented and even contradictory archives of various city-states.
Unfortunately, perhaps because the succession had been too thoroughly severed, or possibly because the contradictions in the city-states' records were too chaotic, to this day, people had not been able to find a more complete and credible account of history prior to the Great Annihilation.
No one knew what the world during the Order Era really looked like.