Bizarre-looking, aquatic swimming creatures, they are widespread in the floating sea of the fifth layer. They are said to eat sedimentary life. Their appearance outside of the water is vastly different to the form they take when swimming, which somewhat resembles an air balloon. Much like all the aquatic creatures of the 5th Layer, they're unaffected by the curse because they have a different set of sensory organs than surface organisms.
Their anatomy is quite strange. All their internal organs are packed into their head, and they spray a mucous produced by their organs through spitting from their mouth. This mucous has paralyzing properties and is used to stop the movement of predators. In some reports, they've been seen using other paralyzed creatures as living shields. Outside of the water they die very quickly and they're not quite so strong, so they're harmless to fish for. Trying to catch one in water is more difficult, and the act of diving into the sea of the 5th layer is synonymous with suicide due to the sensory deprivation of the curse.
They're edible and quite delicious. While their appearance is rather displeasing, they are described to be sweet and tasty. They are considered best to eat it raw, much like how sushi is typically consumed. Their skin is very tough, so it can be used as a plate instead. The oily organs should be removed however, since they're poisonous.