Cutting off Ao's Feet to establish the Four Extremes was something Nüwa had done in mythology.
In the worldview of Huaxia's ancestors, the space between heaven and earth was held up by a poor turtle's legs, replacing Buzhou Mountain.
Foot fetishists, rejoice. Clearly, what everyone sought was to stand tall between heaven and earth.
Although Chu Ge had adapted plenty of mythological material in his writing, he had never written this into his book. In his setting, the Four Extremes were the Four Symbols and had nothing to do with Ao's Feet.
But the problem was that, in his understanding, cutting off Ao's Feet to establish the Four Extremes really was feasible!
So this was how the Heavenly Emperor had stabilized the Heavenly Realm in place of the original Four Symbols after "tricking" them into other planes... Since it happened to align with Chu Ge's understanding as the Heavenly Dao—that Ao's Feet could support the Four Extremes—he had succeeded.
The causality was getting a little convoluted.
Was it because Chu Ge, as the Heavenly Dao, understood this to be feasible that the Heavenly Emperor, as this world's strongest being, could roughly perceive the Heavenly Dao's settings and thus adopted this approach?
Or had the Heavenly Emperor known nothing and simply chosen the correct approach after trying all sorts of things?
Or had the Heavenly Emperor glimpsed events in the Mortal World and copied the answer?
Unknown...
The Cloudreach Sect's ancestral records were too vague. Apart from a hazy account of the battle's outcome, they said nothing, not even a line of dialogue. Even a single exchange might have revealed something more.
But for now, this discovery could count as enough.
At the very least, it showed that the Heavenly Emperor had awakened his own will back in the primordial Chaos,