There has been a common storm that has come since the years of Greek Gods, And Goddess's. They knew that humanity wouldn't be able to survive in the near future, so Zeus himself gathered souls of each mythical creature in the land, then expelled the souls into a certain wave, which would caused a wave.
This certain energy wave, causes the human's DNA to mix with the myth, as they become said myth. A Myth Wave as the people pronounce it, causes bodies to change, while also giving them humanized characteristics. The Myth Wave occurs every 25 years, when civilization grows, and objects begin to get invented. Right now in 2022, another Myth Wave is about to begin. No one knows what will happen, when the wave touches all of them, but whoever does is in for a lot of pain in between.