The Ancient World That Merged with All the Beasts

I accidentally traveled through the prehistoric times, only to find that I was living in an era full of threats at all times. Human civilization has long refused to accept existence, and after a long time, the beast system finally appeared. Let's see how he merges with the beasts and becomes the king of the wild. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.