Now consider Zhenyuanzi's Earth Book.
Even among Top-Grade Innate Spiritual Treasures, the Earth Book ranked at the very top. It contained a full forty-eight Innate Restrictions!
The Earth Book was Zhenyuanzi's companion treasure, and it was only an Innate Spiritual Treasure, so refining it was nowhere near as difficult as refining an Innate Supreme Treasure.
Thus, although Zhenyuanzi had yet to refine the Earth Book completely, he had already refined thirty-six Innate Restrictions.
Once Zhenyuanzi reached the Late-Stage Grand Luo Golden Immortal realm, he could easily refine the remaining twelve.
The power contained within an Innate Spiritual Treasure and an Innate Supreme Treasure was as different as heaven and earth, but so was the difficulty of refining them!
Even if Taiyi reached the Late-Stage Grand Luo Golden Immortal realm, he would probably only be able to refine twenty-four of the Chaos Bell's Innate Restrictions.
And that was only because the Chaos Bell was Taiyi's companion treasure, greatly reducing the difficulty.
Even if Taiyi eventually reached Perfection in the Daluo Golden Immortal realm, he could refine forty-eight Innate Restrictions at most.
Only a Primordial Daluo Golden Immortal could fully refine the Chaos Bell's final Innate Restriction!
What held true for the Chaos Bell held true for the Pangu Banner and the Taiji Diagram!
Bai Yu had been able to fully refine the Profound Light Pearl while still a Daluo Golden Immortal because it was special. He had completely refined it while it was still an embryo, and its degree of refinement had not changed when it later advanced into an Innate Supreme Treasure.
That was why Bai Yu had possessed power at the level of a Primordial Daluo Golden Immortal while he was still a Daluo Golden Immortal.
Back then, Bai Yu had been able to face Qinghong, a Primordial Daluo