There were many bloodlines in the universe, with the human bloodline being the most powerful. The human bloodline began during a time of chaos when Pan Gu split open the heavens and restored peace back into the world.
His body transformed into mountains, rivers, and lakes. One of his eyes turned into the sun, and his other turned into the moon.
Everything in the natural world stems from the aftermath of Pan Gu's body. These include phenomena like thunderstorms, mountains, lakes, and oceans, but they also include the bloodlines of beasts such as lions, tigers, wolves, cheetahs, etc.
Even certain plant species stemmed from the blood of Pan Gu, so technically, their ancestry could also be traced back to the Chaotic Era.
After the end of the Chaotic Era, the heavenly divinities all disappeared, and humanity entered an era of wilderness.