Setting
The world of Final Fantasy XI is known as Vana'diel. It consists of two main landmasses with two smaller islands flanking them, which in turn are surrounded by small islands. It features diverse climates, ranging from the northern glaciers to the southern deserts. The four main cities in Vana'diel are Bastok, San d'Oria, Windurst, and Jeuno. The expansion Treasures of Aht Urhgan added the large Aht Urhgan Whitegate/Al Zahbi city area. The rest of Vana'diel is made up of a number of outdoor, dungeon, and minor town areas split into various regions. While most areas are accessible by walking, various modes of transportation, ranging from the classic Final Fantasy Chocobo and airships to special spells, facilitate movement across the game world.
The events of the game are set 20 years after the Crystal War, when the nations of San d'Oria, Bastok, and Windurst on the main continent of Vana'diel fought and defeated the Shadow Lord and his army of beastmen. A parallel world named Dynamis, in which the beastmen succeeded in conquering Vana'diel, can also be explored. It is described as a dream world created by the god Diabolos.
Characters
The five playable races in Final Fantasy XI are Elvaan, strong melee fighters, reasonable healers but weak in black magic; Hume, a race resembling humans, with no notable strengths or weaknesses; Galka, a race consisting of only males (they reproduce through reincarnation), strong and tough, but weak with magic; Mithra, cat-like humanoids of which only the females of the race are playable characters which are agile and dexterous but lacking in charisma, and Tarutaru, tiny humanoids with incredible power over magic, but physically weak. In addition to the player races, there are two primary non-playable races known as the Zilart, an ancient race which is the focus of the first two game expansions, and the Kuluu, a race of beings similar to the Zilart and thought to be inferior to it. There is also a huge supporting cast of NPCs who give quests and missions and appear in the game's storylines. The game features several typical Final Fantasy monsters, including races such as the Goblin, Orc, Yagudo, and Quadav. Some of these creatures follow the Shadow Lord, a source of the game's conflict.
Story
Players begin the game as residents of one of these three main countries, San d'Oria, Bastok and Windurst, and must help band the nations together against the resurrected Shadow Lord.
The expansion Rise of the Zilart reveals that the Crystal War and the resurrection of the Shadow Lord had been masterminded by the Zilart princes Eald'Narche and Kam'lanaut, who survived the extinction of their race. The two Zilarts plan to become Gods by opening the path to paradise, and the player is charged with thwarting their plans.
Chains of Promathia revolves around the dead Twilight God Promathia, who had originally cursed the Zilart race, and the attempts of various factions to either complete or stop his resurrection. The wyrmking Bahamut is involved in these events, and intends to destroy Vana'diel to prevent Promathia from absorbing the life of the world.
Treasures of Aht Urhgan concerns the Empire of Aht Urhgan which opens up to the nations of Vana'diel. As a new and powerful nation, it is of concern to the nation of the player, who is sent as a representative. The player then becomes embroiled in the intrigues of the Empresses court, and the growing fears of war and darkness coming to Aht Urhgan.
Wings of the Goddess primarily occurs in the era of the Crystal War, 20 years in the past from the main Final Fantasy XI setting. Players discover and cross mysterious time portals, and are led to help the Regal Feline Cait Sith reduce the suffering of the era. The Wings of the Goddess storyline is still ongoing as of 2008.