Because of the war against demons, many smaller worlds were completely destroyed and humans and beasts had been destroyed, luckily it seemed that the demons were not interested in destroying the planets and only killed intelligent people and living beings.
Even if that was bad, it was not the worst because the warriors could not create planets with their power and that would be irreversible, even so, many smaller planets still existed and even the Earth where Zhang Yi was born was not attacked.
So after a few thousand years new warriors would appear on the divine plane and could form more sects and the divine plane would be the same again, the difference was that Zhang Yi ordered the great sects to stop making wars for the next thousands of years. years until everyone recovered.