The Crystal World (クリスタルワールド, Kurisutaru Wārudo?) is the last area in Final Fantasy IX. The final bosses are fought at the end of the road and the only Random Encounters are crystal replicas of the four guardians of Terra.
After traveling through Memoria and viewing their memories and the memories of the planet, the party find themselves in the Gate to Space, reaching the Crystal World. The party travels across a set of roads of pure crystals, eventually reaching Kuja, gazing into the Crystal.
Threatening to destroy the birth of all things, Kuja sends his pet, Deathguise, to obliterate the party, but eventually kills his minion in disgust when he realizes it is being defeated. After Deathguise's fall, Kuja attacks the party himself, utilizing the full powers of Trance. Trance Kuja fails to defeat Zidane and his friends by normal means and resorts to casting the ultimate magic, Ultima, defeating the party and unknowingly summoning Necron.
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The background music played, titled "Crystal World", is a twisted remix of the "Prelude".
The Crystal World is Final Fantasy IX's representative arena in Dissidia where Squall fights the Warrior of Light, and Zidane fights Kuja. Cecil has a confrontation with Golbez in Crystal World during his storyline.
The stage is dominated by two large connected orange platforms in the arena's center surrounded by pillars of crystal. Pillars and platforms made of orange and purple crystal float in the air and form a network of hexagonal platforms around the bottom of the central platforms. Some platforms of rock cannot be destroyed, but the platforms and crystal can be. In the background the Crystal of Final Fantasy IX can be seen spinning inside a large ring. The Ω version of the stage has crystal pillars and platforms appearing in the air in random battles, and the Bravery pool automatically rises each time this occurs. Destroying these features causes them to reappear and raise the Bravery pool faster.
The Star's Core is the battlegen item obtained through stage destruction in this area.
The Crystal World returns in the prequel of Dissidia. Kain fights Exdeath here after beating Firion.