The shattered soul fragments of the "Soul-Crushing Shadow Prison" possessed the ability of "two strikes to kill."
He himself had claimed that "fighting Shiyu Ling, who is also at the Peak of Manifestation, would surely result in the mutual destruction of Domains." It's likely that the number of attacks required might increase to three, and the original effect of full-body shattering might diminish. Even so, this remained an extremely powerful trump card.
The controller's plan was very simple. Considering Shiyu Ling's trait of being "strengthened when outnumbered," they engaged in combat as groups of three, with equal combat power. They took advantage of the terrain unique to the great waterfall, limiting the opponent's movements with controlled gravity. Relying on the self-harming Impermanence Skill, they served as shields to attract attacks and cause interference. Finally, they would deliver three crushing punches, beheading one person.