FINAL FANTASY XI: Chains of Promathia 1.28

While Altana soars on wings of freedom, Promathia is bound in chains; his confinement is said to be a limitation he has placed upon himself. Can this legend be true? And do rumors of the frightening phenomenon occurring in faraway lands have any relation to Promathia? The unfolding mystery of Chains of Promathia will bring adventurers ever closer to the astonishing truth behind Vana'diel's origin.
Chains of Promathia was once considered the hardest expansion in the game. The vast majority of the areas must be unlocked, and many of the areas have a level restriction on them, not to mention enemies that can see/hear through stealth effects. Out of all expansions, it involves the most amount of battlefields and NM fights that need to be won. In spite of this, Chains of Promathia is known by some to be the most epic storyline in Final Fantasy XI.