Ryzom

The game takes place on the planet Atys. Unlike normal planets, Atys is an enormous tree large enough to sustain an atmosphere and multiple ecosystems on its surface and within immense networks of branches and roots.

Four distinct humanoid races, or �homins,� came to exist on Atys hundreds of years prior to the game's current timeline (although it is not specified how or why) and developed into separate, fairly isolated societies in their own favored ecosystems. Interacting benevolently with all four homin cultures, but hostile towards each other, were two additional and far more advanced races: the magical Kami and the technological Karavan. The Kami are depicted as elusive, chaotic, playful, and highly protective of Atys, while the Karavan are more secretive and have never been shown outside their environmental suits or far from their machinery.

In the game year 2481, the homin races were decimated when the hostile, insect-like Kitins were accidentally released from their home deep within Atys's root system. Surviving refugees from all four homin cultures began working together in 2485 to rebuild a single, mixed society in relatively remote areas. Soon came the added threat of the �Goo,� a spreading infestation that renders areas uninhabitable and drives wildlife mad with rage. At release, the game year was 2525.