The fundamental need in managing his Internal Grotto-Heaven was to use the Grotto-Heaven Origin to feed back into a cultivator's Magic Power quality after it had reached its limit, allowing it to climb to a higher level.
This involved a deeper level of life transformation.
Ordinary resources could hardly push things any further, and so the Grotto-Heaven Cultivation Method came to exist, fitted into the Immortal Dao Cultivation System.
Legend had it—
In an era too distant to trace, before the Vast Immortal Domain had been born, the Immortal Dao System had originally only reached the Nascent Soul Stage. Generations of sages used their own wisdom to seek the Great Dao from heaven and earth.
Only then did cultivation methods for commanding the five elements and refining the various qi come into being. And after generation upon generation of refinement, the Modern Cultivation Method was definitely superior to ancient cultivation practices.
But that also depended on the place.
For example, the starting point of the Ice Prison Realm's Immortal Dao came from an Immortal transmitting the law, so the more ancient it was, the more powerful it naturally had to be. But if one cast the scale of time across the entire history of the Immortal Dao—
The Modern Cultivation Method was number one!
How to walk One's Own Dao was what all living beings and myriad spirits yearned for, and the Grotto-Heaven Method was an excellent way to achieve that vision.
Since he knew the meaning behind the existence of a grotto-heaven...
There was a great deal to be said about how to manage and nurture it. Judging solely by Wang Yu's current situation, he would walk the path of the Myriad Transformations True Demonic Dao in the future, so he also had to develop his grotto-heaven in that