The Spirit Academy clearly delineated the timeline.
In the first year of Late Taichu, the spiritual energy of Blue Star began to deplete. Humans did not notice it at first until the Demon Race started to evolve.
Thirty years later, war finally broke out between the Human Race and the Demon Race.
Initially, the Human Race suppressed the Demon Race, almost undefeated.
It wasn't until the 50th year that a Demon King rose, and humanity finally realized the crisis.
From the 50th to the 100th year, it was an era of parity between humans and demons.
After the 101st year of Late Taichu, the situation changed. The Demon Race countered and pressured the Human Race, initiating the darkest fifty years for humanity.
In those fifty years, the Human Race was extremely miserable, yet it was from this period of darkness that humans began to explore a new method.
That was to abandon the cultivation of spiritual energy and switch to the method of Beast Taming.
