Only the chosen may enter that land. The chosen will touch all creation, and obtain that which is truth. It is reason outside of reason—the reason of Agito. It is power—the authority of Agito. The sage proclaims: 'In all things, there is meaning. In all things, mourning will end. Make your choice: will you choose reason, or the power of kings?'
And unto him, I reply: 'I will become Agito. I will sound the knell to shake all the world. When nine and nine meet nine, the depths of reason shall stir. When the seal of creation is broken, a voice like thunder shall sound, and thou shalt know—we have arrived.'
Agito (アギト, Agito?) is a term from the world of Orience in Final Fantasy Type-0 and its prequel Final Fantasy Agito. The Agito is a messiah prophesied in ancient mythology to appear at the time of Tempus Finis, an apocalyptic calamity. The legend of the Agito is written in the Nameless Tome.
Agito is a mythical figure tied to the plans of the world's deities, who seek to find and open the gateway between the mortal world and the unseen realm. Agito is someone who can interact and pass between the realms. Finding Agito and using the power of those who make it up is archsorceress Arecia Al-Rashia's means of finding the gateway, in opposition of Gala's method of slaughtering the population of Orience and breaking the gateway down with a flood of souls.
According to the Nameless Tome, sixteen "constellations" were found at the same time. The Sixteen will arrive in the world at a certain moment in the form of human beings, to see if they have the strength to prevent Finis and open the gateway.
Four of them were abandoned by Arecia in the past 600,104,971 experiments, leaving twelve:
- The First – Ace – represents the power of acceptance.
- The Second – Deuce – represents the power of kindness.
- The Third – Trey – represents the power of knowledge.
- The Fourth – Cater – represents the power of valor.
- The Fifth – Cinque – represents the power of innocence.
- The Sixth – Sice – represents the power of tenacity.
- The Seventh – Seven – represents the power of discernment.
- The Eighth – Eight – represents the power of tranquility.
- The Ninth – Nine – represents the power of action.
- The Tenth – Jack – represents the power of ignorance.
- The Eleventh – Queen – represents the power of wisdom.
- The Twelfth – King – represents the power of judgment.
- The abandoned four represent the powers of fear – Machina, love – Rem, suffering – Joker, and age – Tiz.
One of the concepts tied up with Agito is the Locus of Ten and Six: this means that in theory, sixteen elements of humanity are needed to create Agito, with their different aspects forming a part of the whole. This is referred to in the Rubicus, which tells of sixteen "constellations" that would arrive in human form to try to become Agito. 
It appears the Crystals of Orience vie for the Agito to be born of each one of their ilk and brand humans to become l'Cie to this end. Tempus Finis is initiated once one Crystal controls all of Orience, at which point Pandæmonium will rise. It is said only l'Cie can travel there, and the Judge residing in the sanctuary is to decide one's worthiness to become Agito, or else Orience will be destroyed and the spiral restarted in wait for a new Tempus Finis. It appears, however, that a soul that has given up its essence to a Crystal and become a l'Cie cannot become Agito, thus the number of failed cycles.
The cadet is chosen to become one of the favored candidates for becoming Agito. At some future point, it was said one of the "cadets" would be chosen as the Agito, but the game was discontinued before reaching this point.
In each cycle of history, the warring between the nations eventually permits the arrival of Gala and the Rursan Army. The Agito candidates would become l'Cie to fight them off and die, Gala would absorb their phantoma and the cycle would reset. At some point, Arecia deemed Joker and Tiz unnecessary as part of Agito, and instead, the two were made her servants, able to remember events through the cycles while the rest of Orience forgets.
Marshal Cid Aulstyne uses the name of Agito to gain support from the people of the Militesi Empire, declaring the empire's attempt to claim all of Orience justified under the premise of the empire becoming Agito and heralding the start of a new era. The ones Arecia has chosen to become Agito, the cadets of Class Zero, are caught up in the 600,104,972nd repeat of events.
When Tempus Finis begins and a sanctuary rises from the depths of the ocean, sending out hordes of Rursus to slaughter all of Orience, Cid travels to the temple with the aid of the White Tiger l'Cie Nimbus. When Class Zero learns of this, the cadets recall the words written in the Nameless Tome and surmise Cid is trying to become Agito. Intent to stop him, they follow him.
Unlike in the previous cycles, Class Zero chooses not to become l'Cie, changing the cycle. This prompts Arecia to make Gala call his army. Gala makes Cid the Rursan Arbiter, but he is bested by Class Zero, stalling Tempus Finis. Though victorious, Class Zero perishes. After paying heed to Tiz and Joker's advise, Arecia listens to Class Zero's souls and learns the cadets made their own decision on how to meet their end and do not wish to be revived. Arecia abandons the experiment and allows Orience to remember its past. As the light of the Crystals fades, Orience enters a new era.
Class Zero may not have lived up to the deities' expectations in opening the gateway to the afterlife, but the cadets live up to the meaning of Agito as a messiah in releasing Orience from its cycle of destruction and rebirth.
[aɡɪtoː] is a Latin verb conjugation meaning "I put in motion". It is the first principal part (first-person singular present active indicative) and citation form of the verb; its infinitive form is agitāre, "to put in motion".Agito