The world of mists is a terrarium, a cylinder carved out of an asteroid to contain a self-sustaining ecosystem. Spun for gravity, the interior of the cylinder has a surface area of almost 140km2. An odd effect of airflow through the spinning cylinder has led to permanent mist.
Approximately a third of the surface is covered in lakes and ponds, another third is marsh, and another third is forest. The constant mist has lead to massive amounts of lichens and mosses growing on every available surface. Moose wander the land eating lichen off branches, otters live along the shores of the lakes, and packs of wild dogs hunt through smell at night. The thick constant mist forces all animals to neglect their sight and depend on other senses. During the day you can hear moose bellowing to each other, and at night the dogs howl.
A village has been carved into the sheer cliff that forms one end of the cylinder.. The villagers tend to moist gardens and maintain necessary machines, living meditative lives of routine, including exercises that maximize their hearing. It is because of these exercises that they have become aware of the wanderer, a being that has never been seen. It may be able to see through the mist, for it has always been able to avoid even silent pursuers, but in quiet twilights one can hear the sound of its heavy steps as it roams.