They must have exhausted their resources back then ...
Phoenix muttered to herself.
After all, how terrifying was a civilization that was weaker than level 10?
How deep was their Foundation?
Just by comparing it with the ruins of the elemental civilization in front of him, he knew how deep the foundation of this kind of lower-tier 10 was.
A civilization that had a weaker Level-10 civilization would definitely have a large number of level-9 civilizations.
That was because the base number of grade-9 cultivators was not large. How could a grade-9 with a perfect Dao Foundation be born? how could it be possible to break through to a weaker grade-10?
Some ancient, weak world civilizations had accumulated over hundreds of thousands of years and could even have thousands of level 9s!
How was it possible for such a huge and weak Level-10 civilization to have so little wealth?