The cryst-fairies are humanoid, fairy-like creatures that appear in the Bravely series. According to the Crystal Orthodoxy, the cryst-fairies are the tenders of the Crystals who can become human-sized fiends when they see a need to fight.
According to the Orthodoxy's teachings, the cryst-fairies help vestals in their responsibility to tend to the Crystals. The cryst-fairies ensure that the vestals and even other Crystalists pray to the Crystals and uphold the faith.
Despite what the Orthodoxy promotes, though they value the Crystals, the cryst-fairies are not the benevolent beings they are presented by the religion to be. They are creations of godly beings that carry out their creator's will: Anne was created by Providence to ravage Luxendarc with Ba'als, while her younger sister, Airy, was created by Ouroboros to enact his desire to invade the Celestial Realm.
While Fort-Lune intercepted any Ba'als Anne sent to Luxendarc, Airy nearly reached her quota by traveling through the multiverse while using the Orthodoxy's teachings to deceive versions of Agnès Oblige to assist her in having the Crystals' powers go out of control. Such an event summons the Holy Pillar, which Airy exploits to weave together Luxendarc and its parallel counterparts until Ouroboros obtains his portal to the Celestial Realm.
Airy's plan is foiled when one version of Agnès learns of the deception and watches her comrades, Tiz Arrior and Edea Lee, be killed. That Agnès, wounded and using pendant to warn other versions of herself of the "evil one", ends up in a version of Luxendarc in its past. Found by Sage Yulyana and Lester DeRosso, assuming her to be an angel, Agnès tells them the events to come in her timeline as they and other versions of themselves plan a means to stop Ouroboros if they cannot prevent his coming.
As Airy is five worlds close to her goal, Anne indirectly supports Tiz as Agnès's protector through the will of the being who guided the wind vestal's group. Once Ouroboros is defeated, Anne begins the next phase of her plan by recruiting Kaiser Oblivion on the pretense of helping him. Her plan is to displace the moon for the Ba'als to attack Luxendarc at full strength and unopposed. When that fails, Anne learns of the Great Chasm her sister created, and uses it to forge a direct link between Luxendarc and the Celestial Realm so that Providence himself can manifest.
"Cryst" refers to both the words "Crystal" and "Chrysalis", the latter in relation to the fairies' butterfly wings and fighting forms.
fairy is a type of mythical being or legendary creature, a form of spirit, often described as metaphysical, supernatural, or preternatural.A