"It's like humans relying on their immune system to fight diseases,"
"However, overall, if you manage an oasis to be more vibrant and stronger, and when facing the onslaught of Mysterious Evil tides, make it as undamaged as possible, it will endure the filthy impacts... and with a few more years, perhaps a decade or so of recovery, my City of Fallen Stars will upgrade to a true Superoasis."
These were secrets only known within the circle of Superoasis management.
The most likely outcome for a Level 6 Oasis that tries to upgrade without knowing the insider information is complete destruction and loss of life. Yet, even with its strong foundation, deep resources, and him, a mythological being, sitting firmly at its core, the City Lord of the Ironsteel City still didn't have much confidence... He feared unexpected accidents.
"When it's time to upgrade, we can invite a senior from our main house, but at most, only one can be invited,"
