The Marsh Cave (沼の洞窟, Numa no Dōkutsu?) is a location from the original Final Fantasy. Located southwest of Elfheim, it is full of monsters. It is a dark and maze-like cave with pillars of stone dividing levels into sections, and the Warriors of Light must often enter hollow rooms in the cave in order to get around these barriers. After the Warriors of Light obtain the Mystic Key, they can return to open the last sealed doors on the bottom floor.
The Warriors of Light come here to retrieve the crown, and after defeating a group of Piscodemons (two to four) in the cave's deepest level, they find it. They then return it to its supposed owner, only to discover that he is Astos, and a battle ensues.
|1,020 gil||B3 (Requires Mystic Key)|
|Antidote||B3 (Requires Mystic Key)|
|Silver Armlet||B3 (Requires Mystic Key)|
- Black Widow
- Gray Ooze
- Green Slime
The Background Music that plays inside the Marsh Cave is called "Dungeon".
In the Confessions of the Creator Scenario, a Teleport Stone can be found in the area where the Marsh Cave is meant to be located and has its name. Instead of the dungeon, the Land of the Stolen Crown Gateway is located in the now frozen marshlands, referring to the item the player retrieved from the cave in Final Fantasy.
The Land of the Stolen Crown gateway is a five-floor dungeon that serves as an approximation of the Distant Glory - Redemption of the Warrior storyline from the original Dissidia, acting as a sort of purgatory guarded by Gabranth, whom the player must defeat to escape.