I have created an entire species of countryhumans called Eternals, magical countryhumans who lived millions of years, in a land filled with magic and mythical creatures.  I will go more in-depth about Eternals and the world they lived in in the new headcanon book, but I will say that they were driven to near extinction by an advanced civilization of humans, who ended up being eradicated too and had to start their evolution all over from the start.

There are only five (and a half) surviving Eternals left on the planet:

Esha (Draconic Eternal)

Askad (Naga Eternal)

Uskaine (Centuar Eternal)

Neflen (Human Eternal)

Odrus (Human Eternal)

Sofia (Naga - Griffen hybrid, is actually the evolution between Eternals and Countryhumans)