After the Perseus Arm entered the galactic center, it continued to connect to a large Star Field in the galactic center that was seen as the territory of the Erehuana Military Treaty Alliance.
Although the three great factions of the Milky Way, including the Erehuana Military Treaty Alliance, were ranked at the top of all the factions in the entire Milky Way, it was naturally impossible for them to occupy the entire Milky Way, especially in the galactic center that occupied the most important resource of the entire Milky Way. The three great factions could only occupy a relatively large area each and still have many Star Fields left out of control.
The Kingdom of Saclerda was a kingdom other than the three great factions in the galactic center.