The Hidden Depths - Rashomon Sea.
Black clouds piled high above the sea, brewing a terrifying maritime storm.
Within the dense cloud, intermittent flashes of dark purple thunderbolt light shone through.
On the azure sea, the billows rolled tumultuously, whipped into frothy waves by an agitated sea.
Above the sea, two whirlpools spun close together yet did not disturb each other.
Encircling both whirlpools was a broad belt of sparkling waves. Inside the whirlpools, one could see a smooth, shiny, and pitch-black wall of water, slanted at approximately 60 degrees to the sea surface, spinning rapidly in a dizzying manner, emitting a fearsome noise into the air.
It was like a wail, like a roar.
Stirring the waters into chaotic surges.
In a vast expanse of the sea, where the surface was already turbulent, concentric ripples echoed.
"Woo—"
A giant Skeleton Whale, all stark white bones, let out a long cry as it burst forth from the water.