Cocytus (Japanese:コキュートス)[1] is the name of one of the bonus dungeons in Wild Arms 5, located in southwest Filgaia. It shares its name with a group of villains in Odessa of Wild Arms 2 named after the levels of Dante's Inferno, and both entities take their names from Greek myth, where Cocytus is a river flowing through the underworld, a motif that it shares with the other three optional dungeons: Tartarus, Abyss, and Inferno.[2] There are 15 areas of this dungeon, comprised of many floating platforms, bridges and teleportation devices. The boss battle at the end of this dungeon is with three Lycanthrope monsters, and the player is required to use the Duel Sign cartridge to initiate this battle.