In the Treasure Trove.
After practicing the skills listed in the Pure Yang Scroll for a while, Chen Mobai then began training with the techniques of immortality.
However, compared to his rapid progress in fire attribute spells, his advancement in this cultivation technique was lackluster.
This was due not only to his Wood Spirit Root being nearly half as strong as his Fire Spirit Root, but also his lack of dedication.
But it wasn't entirely his fault; after all, once a cultivator reaches the perfection stage of Foundation Establishment, the technique will be integrated with and become the nourishment for the Pure Yang Scroll's Core Formation process.
By then, the power of the spells he practiced will dramatically decrease due to different spiritual power attributes.
So there wasn't really a need for diligent practice.