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"He himself must 'break before establishing', with only one chance. If he fails, he would lose his cultivation level completely and his spiritual soul would never have the opportunity for reshaping. However, what he needs is but a door, and it's not crucial that he be the one to open it. Why not let the Three Pure Realms—which have evolved a stable world will on par with a supreme deity—act as the door opener instead?"
First, plunge the Three Pure Realms into chaos, then use the people living within to fight and murder each other, shattering the entire world, subtly aligning with the 'Slaying Three Corpses'. In this way, there's also a chance to open that door."