Worldbuilding Wednesday - The Plain of Maws

The infinite layers of the Abyss, home to the innumerable demon hordes. One of these layers is a curious place known as the Plain of Maws.

The land is an endless expanse of wet, spongy terrain, filled with thick, fetid air, with a sense of dread permeating through it, due to the constant, cacophonous growlings of some unseen beast.
The land seems to be some kind of great mountain, as there is no level ground, only rolling hills that seem to mount higher and higher. Reaching the crest of one, only reveals the base of another.
Another curious feature of this land are the chasms. Deep, seemingly bottomless ravines, surrounded by rocky outcroppings. Each chasm seems to be inhabited by some great worm, which will reach out to grasp at anything which strays too close.
The layer is otherwise almost completely uninhabited.

If one is able to reach the very top of the central mountain, usually through the use of portals, they will find the layer's single artificial construct, the Citadel Omniphagia.
It is here that the demonic sin lord of gluttony, Lucid, can be found.
Here, he holds his eternal feast, joined and attended by those who have pledged themselves to him. Foods of all kinds can be found here, in quantities without end.
The lord himself ranges from the size of an ox, to a small mountain, depending how far along his cycle of gluttonous rebirth he is. All those who join him are of comparable sizes.
For a demon lord, Lucid is exceedingly welcoming, inviting all who visit to join him in his feast.
To date, no guests have ever left.

The truth, however, is much darker.

Deep within the dungeons of the citadel, one can find the true face of the demon lord. Little more than a gigantic mouth, Lucid projects an illusory form into the halls above, so that he might court and converse with visitors, tempting them to join his fold. Once a traveller has joined the feast and partaken of the food, they do not stop eating until they are physically incapable of doing so, due to the amount of weight they gain from constant feasting.
At this stage, they are removed from the feast, led into the dungeon, and fed to the unceasingly hungry demon lord below.

The truth is, the entirety of the layer is the body of the demon lord. Unfathomably obese, and constantly growing larger. Rolls upon rolls of fat, slick flesh make up the ground underneath, and the constant gas vented out forming the air. The chasms marking the land are the demon's countless mouths, eternally hungry and feasting upon anything that ventures near. Sometimes the beast sprouts new ones if it grows impatient.

For the most part, other demon lords are content to leave Lucid be. He doesn't keep armies, he doesn't fight wars, and he doesn't form rivalries with anyone. However, he may well be more dangerous than they give him credit for. As he devours more of the life and lands around him, it is entirely possible that he might eat his way through the barriers between layers themselves. Should he ever reach that point, he would have reached sizes and powers far greater than the remainder of demonkind could ever hope to deal with.

And he would have so many more mouths to feed.