Human cultivators can only gain enlightenment through studying with him, but the spirit beasts in the Secret Realm Dojo are a different story. Aside from learning, they can also awaken their bloodlines through the title of "Honorary Shovel Officer". It is indeed a dual-faceted approach.
Therefore, the development of the Dojo surpasses both the Sun Moon Divine Sect and Yun Yi Peak, becoming even more rapid. Three guardian beasts, including the first batch of monster beasts he had subdued namely Big Bull, Golden Treasure, Tiger Gate, etc., had all reached the Bone Refinement Realm, equivalent to the Nascent Soul Realm of human cultivators, about a hundred years ago. At that time, Zhou Yun Feng was still in seclusion, nurturing his nascent soul.
Zhi Ling also reached the Bone Refinement Realm not much later than those older Golden Core Spirit Beasts, after all, it was his spiritual pet, if he didn't treasure it, who else would?