All is one, one is all.
Ash emotionally wanted to refute the Drama Poet's conception, but rationally he knew this was indeed the only method. The devouring World Snake was not a disaster descending from the heavens, nor an enemy on the world's reverse side; it represented the convergence tendency of all mages.
But why does this convergence phenomenon occur?
Is it because the "eight" all perished, their power scattered throughout the world, the phenomenon of entropy increase reaching a turning point, thus spontaneously shifting towards order?
No, the appearance of the devouring World Snake happened when the Supreme of Magic stepped into the Seventh Layer of the Void Realm. Both "Supreme of Magic" and "Seventh Layer of the Void Realm" are key factors. If Ash had stayed in the Seven Heavens all his life, lain flat, the corresponding World Snake would never appear, just like if you don't work, you'd never meet a boss exploiting your surplus value.
