Deep Sea.
When the ocean was first formed in ancient times, many living beings considered the ocean as a planet's [Mouth], ready to devour anything that fell into it.
Moreover, this mouth held a certain allure, as a large number of marine creatures lived in its shallow waters, giving the impression of safety.
However,
as depth increases,
the so-called biodiversity ceases to exist,
with high pressure crushing and swallowing all creatures that reach this level.
Thus, the deepest parts of ancient sea areas came to be called the "Dead Sea," having devoured countless lives since ancient times... "Silence" gradually became a defining trait of the deep sea.
Yet, within such deathly depths, evolved a terribly fearsome group of marine creatures, known among demon groups as "Deep-sea Divers."
Initially living within the Dead Sea, these deep-sea divers were not as 'benevolent' as they are now,
