Hell is an immense myriad of very dangerous worlds and realms inhabited by beings comprised of negative energy called demons and countless monsters and abominations. Demons capture souls tainted by evil and bring them here, to torment them and bask in the energy given off by their suffering. This energy is not only the main source of food for demons, it's also very pleasant to them and contributes to the overall stability of Hell itself.
Most people assume that Hell is a place that exists specifically to punish the soul of the evil and the wicked but, although the end result is exactly that, many denizens of Hell don't see their realm as such and show very little interest in punishing evil-doers for the sake of it. When a soul is brought to Hell, they appear before Menocles, the great judge. Two things can then happen. If the soul is found to be extremely dark and thus of a great value for demons, it is directed to the realm that corresponds the most accurately to their evil deeds and is tormented in order to bring pleasure and sustenance to the demons of that realm. Contrary to popular belief, the torment is very long but not eternal. At some point, the soul breaks down and is, in effect, destroyed, its essence merging with that of Hell. If the soul is judged to be less dark and of a lesser value, it is fed to a succubus and, once digestion occurs, the soul is also destroyed. In the end, the two outcomes are similar but, in the former case, it comes after an excruciatingly long time of torment and suffering. There are some rare instances of very dark souls being fed to a succubus though, usually as a treat and reward for a job well done. Generally, the darker a soul is, the more nutritious and delicious for the succubus who eats it.
Escapes are very rare but not totally unheard of, and some parts of Hell are known to be hiding grounds for damned souls trying to escape their fate. It is said some become demons themselves.
Urbimok
Urbimok is also called the plane of infinite boredom. It's a dismal and gloomy world where massive grey square blocks float in the space as far as the eyes can see, which is not very far because of the thick fog blanketing everything. A cold and perpetual rain fall, seemingly from nowhere, drenching every exposed surfaces and producing a monotonous, maddening noise, amplified by the strange atmosphere of the world that seems to make every sounds resonate.
To an outsider, Urbimok may not seem that bad for an infernal world. After all there are no visible signs of its residents being tortured, no flaming pits and the depressed demons inhabiting it don't looks particularly scary. Those who resided here for a while however would explain to you in a gloomy voice that Urbimok is not just a boring place, it's boredom itself. Monotony is a climate here and the ambient boredom is so thick, it solidified itself and congregated, forming those block over long, interminable eons.
In Urbimok, finding refuge into sleep is impossible and laughing will promptly summon smartly dressed demons of boredom who will politely - but firmly - remind you that laughing or having a fun time in Urbimok is a breach of its law and that any subsequent infringement will get you confined down into the lower chambers of profound disenchantment, at the bottom of the great ocean of gloom. Nobody knows what can be found there, but it's probably very boring. The ruler of Urbimok is a faceless giant named Sysyphe the cursed. whether he is related in any way to the Sysyphe from earthen mythology is unknown.