After reaching the Longevity Realm, a cultivator's physical form and spirit became interconnected inside and out with the Heaven and Earth Law System, leaving behind unique, profound imprints. Certain "undying and indestructible" dharma bodies, such as the Netherworld Nine Hidden Secret Art, could recover even after being ground to ashes because of these imprints embedded in the void.
Memory was likewise part of the structure of one's form and spirit. If it were obscured or lost, a powerhouse on Xue Pingzhi's level would inevitably discover the problem at once.
To put it plainly, such methods were only possible below the Void Stepping realm.
Even if Xue Pingzhi truly remained within the Rakshasa Ghost King's calculations, the trap would only have been arranged elsewhere, from another angle.
Yu Ci knew his own limits well in such matters, so he readily shifted the focus of his research back to Crimson Yin and gained some small results.
The process had not gone smoothly. The relevant techniques involved the structure of the brain palace and were exceedingly advanced. On Yu Ci's side, only Zhao Xiangshan had done some research in this area; compared to the Rakshasa Ghost King, he was a mere firefly before the moon.
Fortunately, Yu Ci's advantage was that he knew Crimson Yin too well. At the very least, there could be no issue with her memories of the Twin Immortals Sect, Juebi City, and the Sword Garden.
Yu Ci specifically locked onto two crucial points: when Crimson Yin's brain had been pierced by his sword, and when she had been provoked by Yu Qing Xuan in the Sword Garden and betrayed the Rakshasa Sect. Together with Zhao Xiangshan, he used methods of "entering the subtle" to sink into the boundary between Crimson Yin's form and spirit, beginning from the foundation