basically it is a stingray looking thing that’s yellow and uses rocks to crush food up as it eats fish and coral and sea plants and sea sponges you can use it to store your ores or get ores from it using sonic reasonter as it does sometimes swallow ores but it can hurt you if you are in the way of it’s swimming or it’s simply hungry aka if you put a bunch of fish in a area with them around less likely they will eat you . they are distantally related to the Twin Sitaray and mate with the males being much smaller about 5% of the female’s size and females are about 55m long and flat and the mating is like a redback spider aka the male is eaten and the female lays the eggs under itself with a nest made of rocks but if a giant predator comes to threaten the Flat Leviathan it will keep swallow the eggs but the eggs are oval shaped because it has two valves one to the womb to keep them safe and the other to the stomach which is circular to prevent accidental digestion the eggs are covered in a chemical which protects them from the stomach acid and also helps the mother to detect it’s babies are in the stomach to vomit it out to swallow back in to the womb again as it does this if conditions are unsuitable in a certain area or if temp plumts as the womb is warm as they live in the deeper parts of proteus mostly and also they adopt random eggs of their own species if they find them and put them in the womb for a bit. note in it’s PDA entry it says also don’t worry about the eggs being inside it they are fine and if they aren’t don’t care about it you are a human