Since ancient times.
Whenever any of the Four Great Giants launched a serious war against another civilization, they never lost... Of course, the Abyss's all-out war—a chaotic, reckless bloodbath—doesn't count.
In fact, don't be fooled by the recent all-out invasions where the Abyss has failed. That's just a rare occurrence; most of the time, blood battles end with the Abyss's victory. How else could so many Level 10 Demons be born?
So, after ten thousand simulations, the Snake of the End was shocked, incredulous. The simulation results were as follows:
In 5000 attempts, it tried to escape the Nightmare World, stay away from the conflicts, and hide in the Multidimensional Plane. In 4000 of those simulations, the result was a dead end. Only 1000 times did it barely survive until it died of old age.
As for the causes of its death.
