Focus Tower

The Focus Tower also called the Doom Castle is the final dungeon of Final Fantasy Mystic Quest. Parts of it are accessible early in the game, but only at the very end of the game does Benjamin gain access to the correct entrance to climb all the way to the top of the tower and confront the Dark King. On his way up the tower, accompanied by Phoebe, Benjamin must defeat four monsters resembling the four that had captured the crystals.