That was not nearly ten thousand, but several tens of thousands!
Several tens of thousands of Immortals descended at the same time. This was something incredibly rare even in the past. Besides the massive invasion launched by the Immortals a long time ago, when they attacked Great Yu Imperial City, the same thing had never happened again.
This was because descending in such a large scale within a short amount of time would waste too many of the Immortals' resources. But this was just secondary. What was really important was that they would also need to bring out what little remained of Morning Dao's power as well.
Morning Dao's power was the strongest power in True Morning Dao World, and that power was bestowed upon them by Dao Chen himself. But there was already very little left of that power. After all… it had been a long, long time since Dao Chen had performed any miracles.