I think Abyss itself is a skeleton, a skeleton that has been growing "up", just like Ilmuyi.
So every 2000 years, instead of descending one layer, it grows one layer "up" with Os as the base. As the price for the upward growth, or the nutrient is to devour everything in the hole (that is, Os of each generation).
At the beginning, Abyss was just a place rich in eggs of desire, probably a deep pit (the kind that can be probed to the bottom). The first generation of aboriginal people modified or evolved their bodies in order to enter the deep pit to obtain eggs, all of which were the same as Regu. Later, the first generation of aboriginal people built a huge altar to realize their wishes, and gathered a large number of eggs of wishes and used them to make wishes. The egg of exclusive wish, etc.) then led to the formation of the Abyss - Abyss, and it grew layer by layer in layers of 2000 years.
Just like human beings walking in space, the farther away from the ground, the lower the gravity, the thinner the air and the lower the temperature as the altitude increases. Rico began to feel cold when she was on the second floor. Take off the cape and give it to Rico. After they crossed the big fault, they were like icebergs and snowfields. The water in the giant wine glass was like hot spring water in the snowfields. The more beautiful it is. And on the fifth floor, the weather is freezing cold, like a glacier, like Everest. The sixth layer of no return has passed through the atmosphere (the sea of corpses) and came to space, so everything here can no longer be explained by common sense, which is why human beings can no longer use human beings after reaching this layer. return in form.
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