"There is no glory to be had alone cub, true glory comes from the pack. Together we hunt, together we prosper." -Horr the Scarred
Mystara began as several semi-independent projects by different teams of writers for Dungeons & Dragons at the time. Their work was gathered and compiled, blended, and combined to form the fantasy world, Mystara. Although it has officially been dropped from production by its creators, many fans continue to develop and evolve this fantasy setting jointly, continuing its original theme of group development. It originated as the Known World, a semi-generic setting used in early adventure modules.
The Planet of Mystara has three principal land masses: Brun, Skothar, and Davania, plus the island continent of Alphatia. The continents of Mystara resemble those of Earth approximately 135 million years ago. The Known World is concentrated on the eastern portion of Brun along with the lands of the Sea of Dawn. The Known World has cultures and a level of technological development that resemble Europe around the 15th century, but without gunpowder. Nations of the known world display a great range of government types. The Savage Coast is affected by the Red Curse, a sinister enchantment which eventually kills its inhabitants through mutation. The Savage Coast is complete with gunpowder. Davania and Skothar are largely unexplored.
Mystara is a hollow planet, with a habitable surface on its interior called the Hollow World. This world is lit by an eternal red sun at the center of Mystara, and serves as a "cultural museum," preserving the societies that have become extinct in the outer world. The existence of the Hollow World is not, in general, known to the inhabitants of the outer world. Two moons orbit the planet. Matera is a moon much like our own, whose phases govern lycanthropy (werewolves, werebears, etc.). Only the Immortals inhabit Matera. They live in a city, Pandius, where they can meet and watch over Mystara. Patera, or Myoshima to its inhabitants, is an invisible moon that cannot be seen from Mystara. Patera's inhabitants have a culture similar to that of medieval Japan. The inhabitants of Mystara are diverse: humans of all races can be found here, along with myriad creatures such as elves, dwarves, halflings, orcs, and dragons.