Celestia City is an ancient city of an unknown origin. It cannot be seen in our plane of space-time, as it resides in a parallel dimension; therefore, it can only be entered through dimensional transcendence. It was a part of the world Terralius. It resembles a bronze and iron steampunk-esque city, floating in the depths of space, surrounded by stars and nebulae. It holds many special artifacts and secrets about the universe, such as the Cherub's Gate blade and the secrets of the science-magic of Thaumaturgy.