Final Fantasy XI: Chains of Promathia the second expansion pack for Final Fantasy XI: Online. Chains of Promathia were released simultaneously in Japan and the US, but in Europe it was released together with Final Fantasy XI and the Rise of the Zilart expansion pack.

This expansion pack expanded the world of Vana'diel by adding new locations, NPCs, enemies, guest and mission into the game. The following new areas that where added into this expansion pack, are:

New Areas

Tavnazian Safehold
Lufaise Meadows
Misareaux Coast
Sacrarium
Riverne - Site #A01/#B01
Phomiuna Aqueducts
Uleguerand Range
Pso'Xja
Carpenter's Landing
Phanauet Channel
Oldton/Newton Movalpolos
Attohwa Chasm
Bibiki Bay
Manaclipper
Promyvion Holla/Mea/Dem/Vahzl
Al'Taieu
Grand Palace of Hu'Xzoi
The Garden of Ru'Hmet
Limbus - Apollyon/Temenos
Dynamis - Valkurm/Buburimu/Qufim/Tavnazia

Battlefield Areas

Monarch Linn
Sealion's Den
Bearclaw Pinnacle
The Shrouded Maw
Mine Shaft #2716
Boneyard Gully
Spire of Holla/Mea/Dem/Vahzl
Empyreal Paradox