Tiara, the capital city of the world, is where the minor noble house of the Crowned Jewel operates and the place that houses all the administrative buildings, wealthy individuals, training centers, etc.
Just as with the floating islands above several towns, this city, too, had a large floating island above the outskirts of the city. However, apart from its size, there is also something else.
Rather than saying that it is a floating island, one could say that it is a floating city.
A large stadium with high seating capacity, some mansions belonged to the noble house and their relatives, The Tower of Spire, the hall of judgment, Sentinel force HQ (police), all of such buildings were built on top of this giant floating city protected by a giant barrier, which prevents unauthorized entrances.
Azzy could only stare at it as he passed by the island, going to the main city to stay there.