5th Layer

The Sea of Corpses is the fifth layer of The Abyss. A vast, frozen wasteland on top of a massive sea, it is the last layer where it is physically possible to return to the surface.

Description
The 5th layer is the world that only white whistles delve into, and according to Shiggy you can count the number of people who successfully returned alive from here with the fingers of your hands. It is the thinnest layer of the Abyss vertically, being only 1000 meters deep, but it is also the widest one horizontally, probably around 10 times wider than the town of Orth. It consists mostly of a large sea with some crystallized sections, held up by a large layer of thick mud and bones, hence the name "The Sea of Corpses". The water is filled with monsters of the sea, and diving deep into the water is synonymous with suicide, because of the danger of the creatures and because swimming back up would make someone succumb to the curse. Because it is the last section of the abyss where it is physically possible to survive a return trip, it is quite common for white whistles to set down here for some time.

Here, the curse takes the form of extreme sensory deprivation, first draining one of their basic senses to the point of Riko not noticing falling down a flight of stairs, then quickly escalating into losing one's very sense of self. This kind of deprivation also makes unintentional self-harm extremely likely, as seen when Riko clenched her jaw so hard she broke her own teeth, yet didn't realize this until she put her finger in her mouth and saw blood.

At the deepest point above the water, a fort was established by the white whistle Bondrewd, named Idofront. A device akin to an elevator exists right on its center, used to transport people through the sea and into the 6th Layer. However, it can only be activated by a white whistle, or more specifically, by a Life Reverberating Stone, the material white whistles are made of. However, since Life Reverberating Stones are especially designed so that they can only be used by their original owners, the elevator is only available to those who have a white whistle of their own.

Species:

 * Hamashirama
 * Narehate

Individuals:

 * Bondrewd
 * Prushka
 * Meinya
 * Praying Hands

Artifacts

 * Sparagmos
 * Zoaholic