The Ambrosia Core is a mass of stars in orbit around the super massive black hole at the center of the Ambrosia Galaxy with around 100,000,000,000 stars.
The Ambrosia Core, like all spiral galaxy cores, is a gigantic expanse of stars in orbit around the super massive black hole that keeps the Ambrosia Galaxy together.
Countless worlds, lifeforms, and civilizations make their home within it. Most notably the ancient late type 3 civilization, the Etymology, had their capital city, Póli Ton Theón, in orbit around the super massive black hole. And its successor, the C.Y.R.E.X, would do the same.
During the Etymology Era, the worlds controlled by the ancient government within the Ambrosia Core would be covered with vast cityscapes. These worlds were immensely rich and powerful, so much so that piratically all resources produced by the Etymology would be funneled into the worlds located there.
This left the worlds located in the galactic arms farther from the capital, bar from special exemptions, much more poverty ridden then those within the core. This was the main cause of the Etymology's constant countless rebellions. Though this practice was very counter intuitive, the Philology Council members were often very prideful and selfish. As such, they wanted to bask in all the riches the galaxy had to offer.
After the C.Y.R.EX destroyed all of the Etymology, it would take control of Póli Ton Theón and retreat within it. As well as several worlds near it. While there, it would continuously and narcissistically, worship itself as a god for millions of years. Because the Ambrosia Core is the location of the C.Y.R.E.X, the Ambrosia Alliance of United Systems only interacts with worlds along its borders out of fear that if they go farther the C.Y.R.E.X will be aware of their existence.
Ambrosia's super massive black hole fully formed around 13,000,000,000 BCE. After this, the first stars of the galaxy would begin to form throughout the remainder of the 12,000,000,000 BCEs. In the billions of years that followed, countless other stars, planets, and lifeforms would continue to come into being.