The Chains of Promathia expansion pack brings a new chapter to the story of Vana'diel, providing brand new missions and quests while expanding the world to previously unseen areas. Fabled legends will also be realized in Chains of Promathia. As the mysteries of Vana'diel are unraveled, additional secrets will be discovered in this intricately designed expansion.

The European retail package will consist of 7 CD-ROMs and is priced at around 50 Euros. Subscribers will receive their first 30 days of access without charge. Aside from Internet service provider access charges, the free trial period will begin on the date players create their first Content ID or character. Any additional Content IDs purchased are also available without charge until the end of the free trial period. After 30 days, players can continue to play Final Fantasy XI by paying a monthly fee of $12.95 (USD) for one Final Fantasy XI character and can create up to 15 additional characters for an additional charge of $1.00 (USD) per character, per month. Tetra Master, the online version of the wildly popular and addictive mini-game from Final Fantasy XI, is also included in the package and is available for $1.00 (USD) per month.Payment for all monthly access charges must be made by a credit, debit or prepaid card with the Visa or MasterCard logo.

The system requirements for Final Fantasy XI for the PC are as follows: Windows 98/98 SE/Me/2000/XP, Intel Pentium III 800Mhz or higher, 128MB RAM, 7.5GB hard drive space, DirectX 8.1, DirectX 8.1-compatible sound card, CD-ROM drive, keyboard, mouse, 56K or faster connection, and NVIDIA GeForce video card with 32MB of RAM or ATIRADEON 9000 series graphics card (AGP). The game's screen text is English, with full customer support (including the 24-hour in-game support) in English, French and German.