Not to mention that the royal city itself was an extremely powerful piece of equipment, possessing the protection of the royal city would provide better shelter, whether facing a great catastrophe or enemy forces.
Especially considering the two family members he cared about, even for gods from the upper realms, they had the ability to break through world barriers and force their way into places like Earth, which was outside the Tanscendence world.
So, from the moment he exposed his identity, it became clear that he would need a truly impenetrable base of operations.
Moreover, the royal city housed various resources and treasures—this was the accumulated wealth of the Orichalcum Kingdom over countless years. If he could access these resources, they would be invaluable for personal use or for nurturing followers.
