As the home of the Illiadian gods, the Marble Cathedral has its own hierarchy within itself; especially due to the fact that the Illiadian gods, despite being related to each other, all have royal and noble titles. While in everyday life, all members of the hierarchy are treated with the same kind of respect, the hierarchy mostly is still used to structure the celestial bureaucracy, as well as to figure out what tasks and duties go to which deities and/or saints, and is structured like this:
The Marble Cathedral is the abode of the Illiadian deities, and often considered the central hub to all of the Illiadian deities' personal realms, which are demiplanes within the Cathedral. The Marble Cathedral is described as a castle with blindingly white walls and floors, littered with statues and stained glass windows of all the different Illiadian Deities, but also saints and Children of the Cathedral. Each deity also has their own Throne Room within the Cathedral, for audiences with visiting Karrin and Mortals, but also visiting deities from other worlds.
Different saints, prophets and heroes of Illiadian mythology and history also make their homes here, as the realms of the different Illiadian deities also act as afterlifes for their followers and servants.
Its dark inverse is The Obsidian Cathedral, where the three deities of Shadow, Sh'ther Kei-Sihr, Tahvihsa and Prethao make their homes.