The peace of the Cloud World only lasted for a hundred years before they started to ostracize those who had merged with beast blood, seeing them as not human.
They either hunted them down or captured them to make them slaves. Only when the Monster race became independent, standing alone as a race, did the situation turn for the better.
However their situation only changed slightly. There were still many human race cities who hunted Monster race people. From the end of the Cloud Desolate Era to the beginning of God Emperor era, in these short ten thousand years, the monster race went from seven hundred seventy-four races down to four hundred and twenty-three.