Nautilus (Final Fantasy XIII)

Nautilus (歓楽都市ノーチラス, Kanraku-toshi Nōchirasu) is an amusement park and the capital of entertainment on Cocoon in Final Fantasy XIII. Nautilus is the home of the popular Pompa Sancta parade, and it also houses tame Cocoon Chocobos of a much smaller build than their Gran Pulse variety. It is known as the "City of Dreams".

Datalog
Centered around the ever-popular Nautilus Park, the 'City of Dreams' is essentially a giant fairground built by the Sanctum for the amusement of Cocoon's citizens, Tourists visit from all corners of the world, keeping the city busy and bustling all year round.
 * &mdash; Nautilus

''Nautilus Park is the crown jewel of the Sanctum-built City of Dreams. it houses numerous attractions constructed with the latest technology, but the true stars of the park are the chocobos and sheep found in the family-friendly petting zoo.''

With the wilds of Cocoon crawling with all manner of vicious beasts, people find the presence of the docile park animals to be a rare and reassuring change.
 * &mdash; Nautilus Park

Story
Sazh and Vanille arrive in Nautilus after leaving the Sunleth Waterscape. They spot an advertisement for the Pompa Sancta Parade, which is followed by breaking news from Palumpolum, showing taped footage of Lightning, Hope, Snow, and Fang attacking PSICOM troops. Vanille recognizes Fang, but when Sazh asks her what is wrong, she says nothing. They attend the Pompa Sancta Parade, which tells the story of the War of Transgression between Gran Pulse and Cocoon. The two make a visit to the Chocobo Corral in Nautilus Park where Sazh announces that he is going to turn himself into PSICOM in the hope of seeing his son once again. Vanille tries to persuade him not to and is about to admit that she was responsible for Dajh becoming a l'Cie when they are pounded by bullets from PSICOM troops.

The two escape to the Clock Tower where they destroy a Midlight Reaper and Sazh comes face to face with his son Dajh who suddenly turns to crystal. The villainous Jihl Nabaat appears and tells Sazh that his son's Focus was to find Pulse l'Cie and then reveals that Vanille and Fang were responsible for his son being turned into a l'Cie. Vanille runs away in tears but Jihl encourages Sazh to pursue and kill her. He follows her to the Fiendlord's Keep where Vanille is hallucinating and sees an image of Sazh shooting her.

Sazh arrives and aims his gun at Vanille but his Eidolon Brynhildr appears and the two attack it, defeating the powerful summon. After the battle, Sazh once again turns his gun on Vanille but is unable to shoot her, because he acknowledges that it will not do anything to help his son. Sazh turns the gun on himself and it appears as though he has committed suicide at the end of the chapter, with Jihl carrying him away in a coffin and Vanille behind him in Purge attire.

However, in a flashback on the Palamecia, it is revealed that Sazh was unable to end his own life. Jihl arrived with PSICOM troops and captured both Vanille and Sazh telling them that the Sanctum would build a memorial in Eden and use Dajh as a monument to "the boy who saved Cocoon". The two are taken aboard the Palamecia and placed in confinement.

The Mall

 * Corps Gunner x6
 * Orion x1, Corps Gunner x3
 * Zwerg Metrodroid x2
 * Zwerg Metrodroid x1
 * Zwerg Metrodroid x2, Corps Gunner x3

The Clock Tower

 * Zwerg Metrodroid x3, Orion x1
 * Orion x1
 * Zwerg Metrodroid x5
 * Midlight Reaper x1 (Boss)

The Fiendlord's Keep

 * Brynhildr (Eidolon battle)

Minigame

 * Flight of the Chocobo (Chocobo Corral)

Music
The themes "Nautilus" plays in Nautilus, while "Chocobos of Cocoon - Chasing Dreams" and the battle theme, "Feast of Betrayal" play in Nautilus Park.

A piano arrangement of "Nautilus" is included on the Piano Collections: Final Fantasy XIII album.

Trivia

 * Even though an official artwork of the entire party at Nautilus exists, only Sazh and Vanille get to visit the place in the game.
 * The park's name most likely comes from the Final Fantasy III airship of the same name.
 * There is a boy NPC within the first section of Nautilus who chases after some other children. If you are close to him he will eventually utter "Run, run, or you'll be well done!", an obvious quote from Kefka Palazzo in Final Fantasy VI.
 * The Fiendlord's Keep is a reference to Chrono Trigger, as the Fiendlord's Keep is the character Magus' stronghold during the Middle Ages.
 * There is a shop in Dollet in Final Fantasy VIII called Nautilus Store.
 * A photo of Nautilus can be found in Hope's house.