When Ye Han triggered the cursed heavenly tribulation, it was not the only tribulation he brought down. He also triggered the Dao-severing heavenly tribulation, as though that terrifying Wretched Old Heaven envied him and wanted to kill him outright...
The crucial point was that, throughout these several hundred years of cultivation under the control of the Mysterious Woman in the Water Spirit Coffin, the Heaven-Devouring Cauldron in Ye Han's divine sense sea had remained silent. No matter how he tried to command or activate it, he could not make it respond...
In other words, during this period, Ye Han could neither activate the Heaven-Devouring Cauldron nor have it absorb his pills to help restore his spell power. Nor could he undertake his various forms of cultivation. In short, it had entered a state much like its previous complete sealing.
Unlike before, this time the Heaven-Devouring Cauldron seemed to have reached some agreement or bargain with the Mysterious Woman. It did not interfere as she controlled his dual cultivation with the White Jade Demon Fox, instead remaining in a self-imposed sealed state. Ye Han could find no way to force it to obey...
Thus, throughout his cultivation with the White Jade Demon Fox, Ye Han could only rely on this Dual Cultivation Method to improve his cultivation...
In fact, even now, Ye Han had yet to understand exactly what method the Mysterious Woman inside the Heaven-Devouring Cauldron had used to control him and the White Jade Demon Fox when he had first confronted her.
He only knew that the White Jade Demon Fox was utterly terrified of the woman inside the Heaven-Devouring Cauldron. She had started begging for mercy before the woman even acted, and Ye Han had been completely controlled before he could think of a solution...
He knew only