There is a very obvious difference between the Void Secret Realm and the Grotto Heaven Blessed Secret Realm, and that is the issue of energy sources.
The energy in the Void Secret Realm is limited, whereas the energy in the Grotto Heaven Blessed Secret Realm is unlimited.
Through countless generations, the energy in the Grotto Heaven Blessed Secret Realm has never diminished; it continuously nurtures various Secret Spirits, becoming more perfect and powerful with each generation.
Individually speaking, the Secret Spirits nurtured are relatively low-level and require less energy, much less than the Primordial Energy needed for the cultivation of Sky Secret Spirits.
However, after so many generations, these small amounts accumulate, and a large number of Secret Spirits are slaughtered by humans, and their Primordial Energy is extracted.
Under such circumstances, the energy of the Grotto Heaven Blessed Land has never weakened, almost able to infinitely regenerate Secret Spirits.
