The Devil's Road exacts a high toll.
The Devil's Road (デビルロード, Debiru Roodo?), also known as Serpent Road, is a passage in Final Fantasy IV that connects Mysidia with Baron. It uses Lunar magic and technology brought to the Blue Planet by Kluya to facilitate fast travel. In Final Fantasy IV: The After Years, the Devil's Road is its own dungeon filled with dimensional warp points.
The elder seals the passage shortly after Cecil and the Red Wings steal the Crystal of Water from Mysidia; however, after Cecil abandons his Dark Knight ways and becomes a Paladin, he reopens it and allows the party to return to Baron.
Ceodore Harvey and the Hooded Man use this secret passage to reach Baron. Throughout the way there, they were supported by a Black Mage and a White Mage, who were sent by Porom to guide them through the dungeon.
The room with teleporters is similar to a room in the Lunar Ruins of Final Fantasy IV.