Any Spellcaster who had possessed a World Secret Domain for more than ten years would discover one mechanism: the strength of a World Secret Domain was directly proportional to its size.
As a Secret Domain expanded, its authorities strengthened with it; as it shrank, its authorities weakened as well. But if the smallest unit of Secret Domain was set as possessing 100 authority, then a Secret Domain 100 units in size would only possess 101 authority. In other words, while the size of a Secret Domain could affect the level of its authority, the influence factor was extremely low. Even long-lived Divine Lords would not make use of this mechanism. After all, compared to expanding a Secret Domain to scheme for that tiny bit of authority growth, using the Secret Domain to produce all kinds of resources was a more suitable management strategy.
Moreover, the most suitable "growing environment" for a World Secret Domain was the Void Realm. If one placed it in Heaven and still wanted it to grow, then the Divine Lord could only feed it full with resources, and the input-output ratio was extremely low. If one truly wanted to raise a Secret Domain to maturity, the only correct method was to foster it in the Void Realm, then take it back once it had grown enough.
In the past, quite a few powerful Divine Lords who had ruled their eras had indeed done this. The success rate was roughly fifty-fifty: half could be retrieved, while the other half were snatched away by other chosen geniuses who used the small to seize the great. Not only did those Divine Lords lose their Secret Domains, they would often target the chosen geniuses because their property was gone, only for the chosen geniuses to still grow up and counter-kill