Yearle- world of black magic
Yearle is a world defined by its dysfunctional deities, and the high quality of life provided by its ubiquitous use of black magic. On Yearle, powerful magical devices are ubiquitous, but they are dependent on the blood of sapient beings to function. Magical beasts are sacrificed in tremendous quantities to power the world's devices, and their blood pumped into special taps in every building in the civilized world. Yearle's two main deities are Mother Whiptail, the reptilian earth goddess, and Pater Nosferat, the vampire god whose rising brings the winter. In ancient times these deities were a couple and the seasons were mild, but they broke up in an epic fight that knocked the planet off its axis, and condemned Pater Nosferat to feed on the world's life-energy, and be destroyed every spring by the returning light of the sun; in spring his followers haul his coffin through the underworld to his palace on the opposite pole.
The Dream Fortress
An enormous fortress on the plane of dreams built following dream logic. It is entirely larger than it needs to be and its layout is mazelike, nonsensical, and inconsistent. Many rooms are distorted versions of locations from the "real" game world. There are many unnecessary rooms, and also many rooms that are 'off' in some way, such as an armory for swordsmen that contains only bows, or a guard post that is also a busy restaurant, or a person's sleeping quarters with a finished basement that does not otherwise connect to the rest of the building.
Dictatoria
An isolated dieselpunk Ravenloft domain styled after early 20th century dystopian literature and early 20th century dictatorships. A city-state whose paranoid leader relentlessly monitors, censors, oppresses, and disappears the populace, searching for a rebels and spies. The land is ringed with walls, trenches, sandbags, and barbed wire, but it's external enemies, whom the country eternally wars against, don't seem to actually exist. When the leader's paranoia flares up, bombs and mortars rain onto the outskirts of the domain, hitting anyone trying to cross the border with high accuracy, but careful investigation will reveal that the bombs apparently originate from nowhere (supernatural border closure).
Dystopialis
A modern Ravenloft domain. A representative democracy with frequent elections, but a very poor choice of candidates. The elections there are always tight races between the No Smiling Party (whose platform involves executing anybody {other than party elite} who does not live a life of self-denial and military discipline), and the No Frowning Party (whose platform involves forcibly euthanizing anyone {other than party elite} who seems unhappy or unfriendly). The occupant of their government's highest office appears to change, but is in fact always held by the domain's darklord, who has a split personality
Thalassonoma
Thalassonoma is a planet plagued by sea-level rise resulting from the overuse of waterwheels powered by decanters of endless water. Now the entire surface is flooded, but since it's already flooded anyway they still use the waterwheels, which are now on floats (as is everything else that's left)
The Problematic Prism
This abyssal realm is full of huge shiny crystals. Many of the crystals have prismatic spray spells trapped inside them, which are released if the crystal is damaged. All spells that fire rays or manipulate light and color have a chance to be diverted off target from where they were meant to go. The layer is inhabited by incorporeal energy beings made of light.
The Sandstorm Plains
In this desert land it rains sand instead of water. The fall of new sand is slow but constant, and makes long-term settlements impossible, as any structures would quickly be buried by the sand. Anyone there needs to keep moving or be buried.
Drankalotaliikaa
The island of Drankalotaliikaa is not a geological formation, but rather a god who got drunk and passed out in the ocean. There is a volcano at one end of the island whose eruptions are the god vomiting. When this happens the priests of Drankalotaliikaa must journey to the volcano and throw in hangover cures.
The Hall of Broken Mirrors
The Hall of Broken Mirrors is an abyssal layer which takes the form of an enormous mirror maze whose mirrors are all cracked. Looking at one's reflection in the cracked mirrors inflicts lacerations matching the pattern of that mirror's cracks. The entire layer emits an aura of bad luck, making actions more likely to fail, and making freak accidents and unfortunate coincidences more likely to occur. The Hall of Broken Mirrors is the haunt of several demon lords presiding over misfortune, including Korath the Thirteenth Son, and Lobolotodon the Bone Breaker
Carcinopolis
Carcinopolis is a party town located in one of the less severe areas of the negative energy plane. It is dedicated to all the things that normally would cause obesity or cancer. The natural wasting and slow healing in negative energy plane cancels these things out.
Helion Cryptum
Helion Cryptum is a system whose sun god has been usurped by a god of the undead. Now its sun sheds a grey light that empowers the undead rather than repelling them. The sun itself is inhabited by a race of reverse vampires who draw power from its light and live beneath its surface.
Planets At War
Abyssal layer #7716 is a starsystem consisting of a black hole orbited by a small star as well as several planets and dwarf planets. The planets, which exhibit some level of control over their orbits, are sentient and all hate each other and endevor to smash each other into slag or knock each other into the black hole or the the sun. This, naturally, is bad for both planets' inhabitants (who also all hate each other), and also contributes to both the sun and the black hole periodically disgorging hordes of incorporeal undead. The system never runs out of planets because new planets occasionally appear through various odd means such as binary fission, being spat out of the sun, and spontaneous pair production.
The Fiendish Forum
Abyssal layer 41315 is a fractally repeating Roman forum. There the demons debate philosophy with each other using the various roman style weapons strewn around. Occasionally the forum is punctuated by some other type of town square and this area will often have appropriately different weapons available.
The Forest of Weapon Trees
The 896th layer of the abyss is an endless forest where all sorts of weapons grow on trees and vines. Mostly of these are edged or piercing weapons that sprout new weapon trees with disturbing speed when left in the corpses of their victims, but there are also blunt weapons and even grenade fruits that explode when thrown, dispersing their seeds.
