earth-enfolding Poseidon
Identity of a god with the physical phenomenon he’s not only responsible for, but essentially is. This might b why gods were assumed to be immortal and unchanging, because their natural phenomena are perpetual, they too must be perpetual.
Vis a vis maybe deities which were patrons of cities which could be conquered, destroyed might’ve been seen as a lesser class of less than immortal; a city and its surrounding farms may be razed but the phenomenon of farming continues elsewhere, so the god of a city is limited, but the good of corn is forever
Likewise a certain body of water may dry up so it’s naiad died, but the hoy of the ocean is eternal

