With the Jade Book of Dao Beginning as the foundation, not only did Zhu Wuyan's strength not decrease after changing her cultivation to Nirvana, but it also improved further and reached the peak of the Golden Core Stage.
Even his spiritual sense had been transformed into Nirvana spiritual sense, which had also reached the peak of the Golden Core stage. Then, it was time to break through the Golden Core stage and advance to the Nascent Soul stage.
The Xianghe Commandery Prince's strength was in the Original Infant Stage, and he often cultivated the Nirvana Arts and Nirvana Sutra in seclusion. Zhu Wuwan sneaked into the secret room of the Xianghe Commandery Prince when he was in seclusion.