A coloured illustration on page 8 of Sword Art Online Volume 12.
Latest image source: Ruranobe
Original image source provided by Gsimenas
Sword Art Online Volume 12, Yen Press releaseEdit
Within the Underworld, Centoria is the capital city, located directly in the center of the human realm. At the heart of the city, and thus all of humanity, is the massive white Central Cathedral tower. Its pinnacle is so high that it can barely be seen, and looming walls hide the square grounds of the church from sight. The Axiom Church is the organization presiding over the entire human race. Its military officials, known as Integrity Knights, are tasked with maintaining order and serve as inspiration to the training swordfighters, who look up to them.
The cathedral is one hundred floors in height, the top floor housing the chamber of the Axiom Church's pontifex. The middle floors are where the Church's administrative agents, such as monks and priests, manage the affairs of humanity. There is also an armory on the third floor and the Great Hall of Ghostly Light on the fiftieth floor.
Illustrator: Tatsuya Kurusu