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The creation of the Dimensional Dungeon was a bit complicated. It required a certain [Space] within the Dungeon, which could be assigned depending on the world that it was gonna become this Dungeon's element.
By using Noah's Divine Realm as the Dungeon's Element, the System was able to teleport Noah's Divine Realm across space and time towards the world it was going to invade, and well anyone inside of it.
There needed to be things assigned, of course, such as the Dungeon Boss, which would make the dungeon disappear if it were to be defeated, alongside the Dungeon Monsters, a small reincarnation system that would constantly revive the monsters and their souls inside, and so on.
Of course, that could also be modified.
Noah became the Final Boss, while the hidden Bosses were assigned to Arthur, Jon, and Clementina. The monsters are all the divine beasts inside the Divine Realm.