Think again...
The so‑called 'Demons from Beyond the Sky' that have existed since the Ancient Martial Era, they weren't able to seize Blue Star back when Martial Arts were still weak, the Seven Limits hadn't yet manifested, and humanity's strength was insufficient. Of course, this was inseparable from the valiant resistance of our forebears, but most importantly, it was because most of these Cosmos Celestial Demons simply couldn't get in—at best only a couple of big cats and small cats!
Let me make a bold guess: because Qi kept patching up the breaches, the number of Demon Nests in the human world had always remained at a controllable low.
However, when the course of history reached a certain node, the human world迎来了 a sudden explosive increase in Demon Nests, a catastrophic Demon calamity outbreak!
This critical node..."
Meng Chuan spoke softly:
"The disappearance of Qi."
Makes sense!
Meng Chuan felt that his conjecture was more than half likely to be correct.
