The Ashes of Destiny Destroyed and Rekindled

Once upon a time, dragons ruled the world. And by chance, humans discovered the power of crystals. When humans finally expelled the dragons, humans finally became the masters of the entire continent, and humans themselves split into empires and federations, starting a millennium-long dispute. Thousands of years have passed, and when the older generation of dragons have withdrawn from the stage of history, the young dragons have also learned how to use the power of crystals during this long period of time. How will they make a comeback?