Crossbone Island

Crossbone Isle, located somewhere within the Karagol Sea, "doesn't seem to be on the map" because it is not yet charted by the ferries that sail across that sea. The ferry on the far right arrived completely by accident.Crossbone Isle is an optional and secret dungeon-style location in Golden Sun and is easily viewable as that game's primary "super-dungeon", much like how many Role-Playing Games feature one or more dungeons more challenging than the normal "final dungeon" that game features. It is filled with powerful and unique enemies and equipment within its ordered series of ten floors of puzzles, and is most notable for having the most powerful monster in the game that aspiring players can fight, Deadbeard