It is considered the core city for humanity's resurgence after the Great Cataclysm . While the interior looks like a city, it is in actuality a 666-floor tower visible from all parts of the world. Its construction was overseen by Kuzaka The Wise, one of the Seven Philosophers and creator of the Innocents. Although it was built to re-inspire humanity, its completion was what caused the current demonic invasion, as well as the appearance of the Obelisks, which drastically altered the landscape of the regions they appeared within.