Alien Species!

Not all the individuals of the destroyed carbon-based civilizations had necessarily perished. They were more likely to have been modified into slaves and new biochemical weapons by the alliance of the Pangu Civilization, just like human beings domesticated wolves into dogs, wild animals into livestock, and broncos into war horses.

After the Nuwa Clan broke away from the alliance of the Pangu Civilization and raised a war that inevitably led to the destruction of both the Pangu and the Nuwa civilizations, the past 'cattle' naturally ran away. A tiny proportion of them slowly regained their wildness.

Deep inside their genes, it was possible that the memories of their ancestors from millions of years ago were stored, which allowed them to generate high wisdom and boast powerful techniques far exceeding the understanding of human beings.