Crystal stasis

Crystal Stasis is a state a l'Cie enters upon completing his or her Focus in Final Fantasy XIII and Final Fantasy Type-0. The legend states the completion of one's Focus and entering crystal stasis grants the l'Cie eternal life.

Datalog
''For l'Cie, successful completion of a Focus holds the promise of eternal life in the peaceful slumber of crystal stasis - or so the legends say. Yet to spend an eternity as an immobile crystal is not so very different from death. The people of Cocoon consequently fear being marked as a l'Cie, equating the fal'Cie's brand with a death sentence.''

Faced with only the choice between eternal damnation as a Cie'th and eternal imprisonment in crystal, it comes as little surprise that many l'Cie decry their fate.

Final Fantasy XIII
When a l'Cie completes a Focus their body turns to crystal and they become inanimate objects. They are not dead, but resting in what some call a "crystal sleep". It is possible to recover from crystal stasis, whereupon the l'Cie comes back to life exactly as they were when they were placed in the stasis. L'Cie in crystal stasis are still aware of what happens around them; in Final Fantasy XIII -Episode i-, it is revealed Serah saw and heard everything Snow did through him carrying her crystal tear.

At the end of Final Fantasy XIII, Vanille and Fang communicate their thoughts despite being in crystal stasis, but the dialogue is only heard by the player, and in fragment entries from Final Fantasy XIII-2, it is shown Fang and Vanille are aware of a number of events despite still being in stasis.

L'Cie who are in crystal stasis may "dream" of things they cherish; when Serah and Dajh talk to each other at the end, Dajh says "there were a lot of chocobos", alluding to what he might have "dreamed" while in crystal stasis. In Final Fantasy XIII-2, Serah reveals she dreamed about reuniting with Snow and Lightning.

The legend that completing one's Focus, and being encased in crystal, grants eternal life, originates from the fact a fal'Cie can call its l'Cie back from crystal stasis to give its servant a new Focus. This way, as long as a l'Cie keeps completing his or her Focus, they can enter crystal stasis multiple times and be revived to live again once their fal'Cie needs their assistance. However, this only leads to a life in slavery under their fal'Cie master.

It is demonstrated that completing a fal'Cie-given Focus is not the only way to enter crystal stasis: the Pulse legends state the goddess Etro stopped Ragnarok during the War of Transgression by placing Fang and Vanille in crystal stasis before their Focus could be completed, and Cid Raines enters crystal stasis despite having outright defied the Focus given to him by Barthandelus.

It appears the l'Cie may have the power to overcome their fal'Cie-given Focus and give themselves a new one. Whether or not entering crystal stasis was done on Cid's own accord or not, Barthandelus is still able to revive him from the stasis and give him a new Focus. The case with Vanille and Fang is less clear; their fal'Cie, Anima, did not revive the pair from their crystal sleep for 500 years, and it is unclear whether they were revived by natural methods (the effect of crystal stasis simply running out on its own due time), or if they were taken out of their crystal sleep by an unknown outside force.

At the end of the game the entire party, as well as the world of Cocoon, crystallize. As revealed in Final Fantasy XIII-2, Etro was touched by the plight of Lightning and her friends, releasing them their crystal stasis almost immediately after having been placed in it along with Serah and Dajh. Fang and Vanille remained in crystal stasis, perhaps indefinitely, due to crystallizing themselves willingly. The act Etro committed causes a rift in time which drags Lightning away, with only Serah remembering her ever reuniting with them on Pulse's surface. This is where the story of Final Fantasy XIII-2 comes into play.

Final Fantasy XIII-2
Vanille and Fang spend the game in crystal stasis and protecting their crystal becomes a plot point when Cocoon's crystal pillar comes under threat. In the end, Sazh salvages Fang and Vanille's crystal from the pillar right before it crumbles.

At the height of her battle against Caius Ballad, Lightning realizes the world's impending fate to be unavoidable. In the DLC episode "Requiem of the Goddess", she meets Serah's spirit who asks Lightning not to regret sending her out to travel through time; the only thing she asks for is for Lightning to always remember her.

To fulfill Serah's final wish Lightning enters crystal stasis to hold on to hope and embody Etro's will. In the secret ending to the "Requiem of the Goddess" downloadable episode, it is shown that in a distant future Lightning will awaken.

Lightning crystallized herself because "even in the waves of chaos, it never loses its shine" and the crystal she becomes is said to be indestructible. However, saving Fang and Vanille's crystal is part of the plot, and it is unclear why their crystal wouldn't be similarly indestructible, although it may only mean that Snow and Hope's worry over Fang and Vanille's crystal was unnecessary.

Final Fantasy Type-0
L'Cie of Orience are branded and given their Focus by the Crystal of their nation, and it is inferred that l'Cie crystallize when they die or when they complete their Focus, or simply when the Crystal deems the l'Cie's purpose has been served. A small item called a Pyroxene may be found at the site where the l'Cie entered stasis, and it contains the last thoughts of the l'Cie before crystallizing.

There are three examples of Crystal Stasis shown in the game. Qun'mi, a Byakko l'Cie, crashes in the woods of Lorican territory after deploying an Ultima Bomb to annihilate the country. She is crystallized after she willingly relinquishes her l'Cie powers to Machina. Caetuna crystallizes after summoning the Grand Eidolon Alexander, and her crystal promptly shatters, probably due to the gravity of Alexander's summoning.

In the game's end, Machina, a Byakko l'Cie, and Rem, a Suzaku l'Cie, arrive at the Palace of All Magic to duel each other, which leaves Rem terribly wounded. While their crystallization is never shown, the two are later found by Class Zero in crystal stasis, with Rem in Machina's arms. Following the final battle, Arecia arrives to release Machina and Rem from their stasis, in order for them to preserve Class Zero's legacy in a world where memories of the dead will no longer be forgotten.

Zhuyu and Nimbus enter crystal stasis during the time of Finis, although the former's is documented in a narration and the latter's is recorded in his profile in the Crimson Codex. Zhuyu was crystallized after defending Magic Academy Peristylium Suzaku from the attack by the Lulusath Warriors, and Nimbus entered stasis after taking Cid to the Palace of All Magic.

Final Fantasy XIII

 * Men in crystal stasis are crystallized with their eyes open, while women are crystallized with their eyes closed.
 * Pulse l'Cie are nude while in crystal stasis, but they regain their clothing upon awakening. Cocoon l'Cie retain their clothes, though an artwork representing Dajh in crystal stasis depicts him nude.
 * When l'Cie enter crystal stasis, they glow blue. When l'Cie awaken from crystal stasis, they glow red-orange.

Final Fantasy XIII-2

 * Models for Serah and Cid Raines in crystal stasis exist on the Final Fantasy XIII-2 game disc, but they are never used in the game, making them dummied content. It is unknown why the models exist in Final Fantasy XIII-2 when they are never used.