The Astral Dragons, were not the original species that existed on the Mycroft Continent.
At the beginning of this world, there were no signs of any Pentashade Dragons or Metallic Dragons. There were only the Old World Dragons, all sorts of gigantic draconic beasts.
These super monstrosities were being called the Elder Dragons. They had been breeding continually on the earth. However, they had almost descended into eternal rest due to a long period of time. They had left their bloodline behind, creating all sorts of daemon prototypes throughout the world. And during that period of time where the Elder Dragons were hibernating and all sorts of beasts were multiplying, the Astral Dragon species had appeared in the sight of humans.