Mysidian Tower

The Mysidian Tower is a dungeon from Final Fantasy II. It is where the spell Ultima is sealed away. It is the longest dungeon in the game, on par with Pandaemonium.

The Mysidian Tower's floors 2 to 7 represent the standard elements of Fire, Ice, and Lightning. The enemies and treasure found vary depending much on the floor's theme. Floors 2 and 3 have a deep red tinge to their halls, and Floor 3 includes damaging pools of lava and the first boss, the Fire Gigas. Floors 4 and 5 instantly switch to a pale and frosty blue, complete with dangerous ice spikes set into the ground. On Floor 5, the Ice Gigas awaits. Floor 6 represents Lightning, and so their halls branch off into many forks, some over seemingly bottomless pits. Floor 6 holds the last elemental giant, the Thunder Gigas.

Floors 7, 8 and 9 are a trove of powerful monsters and precious treasures. The White Dragon guards the Black Robe, and a copy of Gottos attacks the party after they obtain the Flare Tome from a chest. The final and highest floor is one large room that houses the hidden power of Ultima.

Story
Firion and his allies attempt to reach the tower to unseal Ultima, and gain the power needed to defeat Emperor Mateus. However, as they approach the island where the tower is located, they are swallowed by Leviathan. They manage to escape, and continue to the tower. As they climb the tower, they must fight three powerful gigas monsters on their way up. At the top, they see Minwu attempt to break the seal. He succeeds, but uses all of his strength to do so, and dies as a result. Firion then proceeds into the chamber, where he acquires Ultima.

Music
The background music that plays in the Mysidian Tower is called "Tower of the Magi".