It enjoyed prosperity under the Church and its Magic Academy, but an accidental magic surge in 995 turned it into a ghost town. Also referred to as the "Old World" due to its ruins and status as the origin of all magic. —Drakengard 3

An enormous city created by the Cataclysm.

The Cathedral City, alternatively known as the Imperial City and retroactively referred to as the Old World, is a great futuristic city that appeared on the Iberian peninsula in AD 856, and was turned into a ghost town in AD 995 by a catastrophic magical upheaval. It was said to have been the origin of all magic, possessing spells that were beyond its time. It was ruled by One the Intoner and served as the capital of Midgard during the Intoners' rule. It became the capital of the Empire later on. It is where the Cult of the Watchers was originally formed and where the first sealing ceremony was held.

In year 856 the Great Disaster occurs which brings dragons, watchers, and otherworldly creatures to Midgard, while at the same time a mysterious city mysteriously appears. in 865, 11 years later, this mysterious seemingly modern city would be called the Cathedral City.

What the Cathedral itself was used for is not known, however given the many hundreds of books and records kept within its walls and that it was well stocked with troops when the Intoners liberated Midgard in The Intoner Resurgence, it can be assumed that it was the headquarters for either The Church or perhaps the Lords of the Land.

By year 998, the Intoners were created and One took up direct residence within the Cathedral where she oversaw the division of land amongst her sisters the empire as a whole. Zero would first battle her sisters on the steps directly outside of the Cathedral and lose, her arm being blown off and her dragon Michael being killed in the battle.

In the Sky of the Cathedral City is where Zero and One engage each other in aerial combat, while her Disciples fight the soldiers on the ground.

The Cathedral is at the center of the Cathedral City.

The Underground Lair is a location under the Cathedral.