Pei Xuanjing obtained this page of the Netherworld Book from the Fair Prince.
When he got the Netherworld Book, the simulator detected that if he could refine this page of the Netherworld Book, he could gain a hundred thousand Tao points.
A hundred thousand Tao points was undoubtedly a tremendous wealth for Pei Xuanjing, which could sustain him for two life simulations.
Thus, he chose to go into closed-door cultivation at this time, hoping to refine the Netherworld Book in a short period and thereby enhance his strength.
After more than two months of closed-door cultivation, Pei Xuanjing finally refined this page of the Netherworld Book, receiving a hundred thousand Tao points.
Yet, Pei Xuanjing's benefits from this closed-door cultivation weren't mere Tao points. The information he gleaned after refining the Netherworld Book was immensely beneficial, and his perception of this world became clearer.