Final Fantasy XI, also known as Final Fantasy XI Online, is a massively multiplayer online role-playing game, the first to offer cross-platform play between PlayStation 2 and personal computer. It was also the Xbox 360's first MMORPG. All versions of the game require a monthly subscription to play.
The setting of Final Fantasy XI is the world of Vana'diel, a rich world with diverse climates, ranging from northern glaciers and southern deserts, to ethereal realms and sky landmasses.
Ancient lore states that Vana'diel was created as a playground for the Gods and their children, who themselves were spawned from an enormous and sentient Crystal. The creation lore's sentient Crystal, Gods, Children, and the truths behind them feature as major plot points in several Final Fantasy XI expansion packs.
The events of the game are set 20 years after the Crystal War, a devastating war where the Middle Land nations of Bastok, San d'Oria and Windurst fought and defeated the Shadow Lord and his army of Beastmen. Players deal with the aftermath of this conflict in the original story, and may travel back in time to aid in the war effort with the expansion pack Wings of the Goddess. Several parallel worlds are available, such as Dynamis and Abyssea, in which the beastmen won the Crystal War and conquered the land.