So we make our way throught the Mirage Tower and ascend to the Flying Fortress. It has 5 floors and the 4th floor is a maze and along the way we find Adamantite. At the very top we encounter Tiamat and restore the final crystal.
Timestamps
0:00:33 - Mirage Tower
0:13:09 - Blue Dragon
0:13:47 - Flying Fortress 1st Floor
0:18:40 - Flying Fortress 2nd Floor
0:24:08 - Adamantite 2nd Floor
0:26:20 - Flying Fortress 3rd Floor
0:33:35 - Flying Fortress 4th Floor Maze
0:38:15 - Flying Fortress 5th Floor
0:38:55 - Tiamat