Undercity Pharos

Undercity Pharos (Arcanian name, Tal'fa Palacaleo) is one of The Seven Wonders in Unlimited Saga. It's located underneath Iskandaria and is the final dungeon for Mythe

Unlike the other Seven Wonders, only Mythe and Ventus can explore Pharos fully. The entrance to the Undercity is located in Iskandaria and can be accessed at any time without needing a quest. However, once you explore the entrance you find yourself trapped by large doors, sealing off the proper portion of Undercity Pharos of which only Silver Girl can open.

It is also here that you will find, possibly, the hardest of the 7 final bosses.

Trivia

 * The name 'Pharos' is most likely a reference to the Pharos of Alexandria, one of the Seven Wonders of the Ancient World, while the concept and looks of the city itself seem to have been inspired by Plato's myth of Atlantis.