The deep sea was the bottommost layer of the world, the foundation of the universe, a place beyond the reach of even the light of order that governed reality and matter. Within the primordial, chaotic "background turbulence," nothing from the real universe could gain a foothold. Only after being distorted and reshaped through layer upon layer of realms could all things appear in those depths of darkness as "projections."
Even the mighty gods had to obey the laws of the world itself. The divine kingdoms of the gods were the largest and most stable clusters of projections in the deep sea. Over the long ages, the "imagination" and "belief" of mortal beings toward specific targets had shaped the order and forms of these projections, while the gods operated precisely alongside their divine kingdoms along paths defined by currents of thought. In other words, beyond the barriers of those divine kingdoms, in places untouched by mortal thought, lay an immensely dangerous "void dead zone" for the gods. Any deviation from course was forbidden, and standing in the void's darkness without the protection of a divine kingdom's barrier was enough to erase one's very existence.
But there were always exceptions.
Some gods had successfully broken free of the shackles of their divine thrones and no longer went mad merely from straying from mortal thought. They could move through the deep sea to a limited extent, and as long as they did not linger too long or venture too close to the divine kingdom projections sustained by thought, such exploration was safe and controllable. An outstanding representative of this sort was Goddess of Magic Milmina, who wandered through the deep sea whenever she had nothing better to do and often stood at a safe distance to peer into other people's yards.
Then there