Sin

Sin (シン, Shin) is a primary antagonist in Final Fantasy X. It is gargantuan whale-like beast which threatens the world of Spira in Final Fantasy X. It was named by the people of Spira who believed that the beast came into being as punishment for their ancestors relying on Machina and becoming a hedonistic society. By following the teachings of Yevon, the people of Spira believe one day they will atone for their crimes and Sin will vanish. However, this is a lie, and the leaders of Yevon believe Sin cannot be destroyed for good and will plague Spira forever.

Origins
Sin was created during the Machina War between Bevelle and Zanarkand, Bevelle relying on Machina to fight and Zanarkand using Summoners. When Zanarkand began to lose, a Summoner of Zanarkand, Yu Yevon, devised a plan to both defeat Bevelle and preserve the city of Zanarkand. Yu Yevon called the surviving people of the city together and transformed them into Fayth as conduits for a massive summoning that created a spectral version of Zanarkand from the dreams of the former Zanarkand's inhabitants. Yu Yevon set this dream Zanarkand out to sea, then called pyreflies to himself to craft the first Sin. Sin was given two objectives: protect the dream Zanarkand, and to ensure it was not discovered, destroy any city that grew too large or relied too heavily on technology. The strain of trying to control Sin was beyond Yu Yevon, and the process destroyed his mind, removing any conscious control he may have had on Sin. Sin thus became a monster that knew only its two instincts, and indiscriminately attacked cities and villages all over Spira, starting with the true Zanarkand itself.

To allow Spira a reprieve and hope for salvation, Yu Yevon's daughter, Yunalesca, presented a way to destroy Sin - the Final Aeon, a powerful Aeon born from a bond of love. Sacrificing her husband Zaon for the ritual, he became the Final Aeon and destroyed Sin. However, Yu Yevon's spirit possessed Zaon's body, and over time Zaon transformed into a new Sin. During this time, though, the new Sin was too weak to terrorize Spira as it grew, establishing a temporary time of Calm where the people of the world did not need to fear it. Apparently the only one able to create the Final Aeon, Yunalesca became an Unsent and taught the people of Spira that if they atoned for the sins of Bevelle and Zanarkand during the Machina War, one day Sin would be vanquished for good. In truth, Yunalesca and the highest leaders of the Church of Yevon she founded knew that Sin would always return, but their teachings gave Spira hope and kept its citizens from giving into despair from the horrid truth.

Shortly before the beginning of the game, a young Seymour Gaudo confronts (and possibly defeats) Sin alongside his dying mother. Seymour's mother becomes the Fayth for his aeon Anima though it is unclear whether he used Anima to defeat Sin if indeed he did at all and whether or not Anima is considered a Final Aeon.

Final Fantasy X
For a thousand years this cycle continued - Summoners would go on a pilgrimage to hone their abilities as they traveled to the ruins of Zanarkand and met Yunalesca, who would then transform one of their Guardians into a new Final Aeon. The Summoner would then give his or her life to call the Final Aeon and destroy Sin, and Yu Yevon's spirit would possess the Final Aeon and turn it into a new Sin. Ten years before the start of Final Fantasy X, Braska, Jecht and Auron were the most recent band of Summoner and Guardians to complete their pilgrimage and were told the truth by Yunalesca before Braska obtained the Final Aeon. Though Braska held onto the hope that perhaps this time Sin would not return, Auron and Jecht believed otherwise and wanted another way. Unable to think of one, Jecht became Braska's Final Aeon and tasked Auron with finding a way to the dream Zanarkand he had come from and taking care of his young son Tidus. As before, Braska died and Jecht became the new Sin.

Ten years later, Jecht, still conscious and aware within Sin, invaded the dream Zanarkand, and he and Auron took Tidus into the real world of Spira. As Tidus traveled with Braska's daughter Yuna as a Guardian, Auron accompanied them and taught Tidus about Jecht and Braska. The hope for Auron and Jecht was that somehow, Tidus and Yuna would find a way to destroy Sin for good without having to resort the Final Aeon which would never do so itself. Tidus was also made aware of Jecht's spirit resting within Sin, and was told by Auron Jecht wanted Tidus to kill him to free him from his fate of terrorizing the world. When the band confronted Yunalesca, Yunalesca told them that the Final Aeon would not destroy Sin permanently, but Braska chose this path to give the people of Spira hope. Denouncing the tradition as a false hope, Yuna refused to sacrifice one of her guardians, and she and her guardians destroyed Yunalesca, and with her the way to create a new Final Aeon. Tidus suggest to the party that instead of killing Sin itself, they find a way to destroy Yu Yevon's spirit inside Sin, and thus if the current Sin dies a new Sin will never be born. The party wages a full scale attack on Sin with the airship Fahrenheit, the party damages Sin enough to cause it to crash, and then enter its mouth to find Yu Yevon. In the deepest part of Sin they find a recreation of the dream Zanarkand in ruins, where Jecht awaits them. As the core of Sin, Jecht must be killed for Yu Yevon's spirit to emerge and seek a new Aeon to possess. The party destroys Jecht and Yu Yevon emerges. Yuna calls her Aeons one by one and Yu Yevon possesses them, and the party then destroys them as well. With no Aeons left to control Yu Yevon himself fights the party, and they kill him in a final battle, Yuna performing a Sending to place his spirit at rest. With Yu Yevon's defeat, Sin is vanquished and the Eternal Calm begins, Spira finally freed.

Within Sin
Within Sin is a location inside Sin and also the game's final dungeon. The party enters inside the beast after having penetrated its armor, and make their way to the center where they face Braska's Final Aeon and eventually, Yu Yevon.

Abilities
Sin is immune to most conventional form of weaponry and is highly resistant to attack, able to project a barrier to protect itself. It is believed in-game that only the Final Aeon can kill Sin, and all attacks the party wages on Sin in Final Fantasy X only serve to wound it - it is not until the death of Yu Yevon's spirit that Sin actually dies. Sin's signature attack is a huge blast of energy from its mouth known as "Giga-Graviton." Its other body parts are capable of using lesser Gravity-based attacks.

Sinspawn
Sin can create smaller creatures, Sinspawn, from its outer layer. Coming in a variety of shapes and levels of power, the Sinspawn cause trouble for any person that crosses them until Sin arrives and reabsorbs them.


 * Sinscales: Generic Sinspawn.
 * Ammes: A Sea Anemone-like Sinspawn.
 * Echuilles: A Jellyfish-like Sinspawn.
 * Geneaux: A Sinspawn found at the entrance of Kilika Temple, hiding inside a tough shell.
 * Gui: A Fusion of various Sinspawn gathered by the Crusaders for Operation Mi'ihen.
 * Genais: The absolute strongest Sinspawn, with the same shape as Geneaux.

Boss

 * ''Main articles: Sin (Fin), Left Fin, Right Fin, Sin (Core), Sin (Head)

Sin's various body parts are faced several times during the game.

Etymology
Sin's name in both Japanese and English is a reference to religious concept of "sinning," willfully committing an act against one's religion. The name is also tied to the Semite moon god "Sin," also worshiped in Sumeria as Nanna.

Gallery
Sin