Sin

Sin is a gargantuan beast and the main antagonist of the 2001 Square Co., Ltd. console role-playing game Final Fantasy X.

For one thousand years Sin had roamed Spira with one purpose: to bring destruction to any living thing. Sin was discovered to be the armor of Yu Yevon by a summoner named Yuna and her guardians. There was only one known way of destroying Sin. A summoner, a sorcerer/sorceress that can summon beasts known as aeons, can make a pilgrimage to the ruined city of Zanarkand. There, the summoner must offer one of her guardians to Yunalesca, an unsent who was the first summoner to defeat Sin, so she may forge the guardian into a powerful aeon known as the Final Aeon, one with enough power to destroy Sin. But there was a flaw: although the outer shell that is Sin would be destroyed, Yu Yevon would possess the final aeon to create a new Sin consisting of the soul of the sacrificed guardian as its core. A period of time would then pass where this "baby Sin" would grow and not threaten the citizens of Spira. This period, which is variable in length, is known as the Calm.

Additionally, the summoner dies after destroying Sin. Contrary to popular belief, this is caused not by the Final Aeon itself attacking the summoner but by the fact that a summoner must give his/her very life energy to evoke the Final Aeon into being. It was also believed that it may be the actual possession of the Final Aeon by Yu Yevon. The strong mind link the summoner and the final aeon share is instantly severed which is the act that results in the death of the summoner. Maester Seymour Guado desired to use this to his advantage by attempting to wed Lady Yuna so that when they reached Zanarkand, Yuna would make him the fayth of the final aeon and eventually Sin. By doing this, Seymour could end the suffering of Spira by destroying all of its inhabitants.

Sin and the events of Final Fantasy X
High Summoner Braska, accompanied by his guardians (bodyguards) Jecht and Auron, was the latest in a line of summoners who completed the final summoning. Braska used Jecht for the fayth in the final summoning, in effect turning Jecht into the newest incarnation of Sin. After the traditional period of Calm, Sin/Jecht returned to wreak havoc on Spira, destroying Kilika Port. A new generation of summoners assembled and begun their pilgrimages to Zanarkand, including Braska's daughter Yuna. Meanwhile the Al Bhed attempted to create machina that would defeat Sin, allying themselves for the first time with the organization of warriors against Sin — the Crusaders, though they were excommunicated for the alliance. The attack, known as Operation Mi'ihen, was a disaster, though. Sin overpowered the machina and destroyed it, and many of the Crusaders died battling the Sinspawn.

Yuna and her guardians, including Tidus, meanwhile discovered the plots of Seymour. When Yuna revealed to Tidus the nature of the final summoning, he persuaded her to aim for an endless Calm, killing off Sin at its heart once and for all. Yuna led her guardians inside Sin after immobilizing its outer powers, and they met and defeated the embodiment of Jecht, then the dark power inside Sin that was Yu Yevon, slaying each aeon that it merged with, as well, and finally, with no where else to hide, its true form. This destroyed Sin permanently and initiated the Eternal Calm.

Sin and the events of Final Fantasy X-2
Sin does not actually appear in Final Fantasy X-2, having been utterly destroyed two years prior to the beginning of the game. But the game prominently shows the rarely-explored side of the quest to save the world: for the first time in a millennium, people need no longer fear Sin. Now the inhabitants of Spira must figure out what to do with their freedom. Another important plot revolves around Vegnagun, an incredibly ancient machine, designed hundreds of years ago to destroy Sin. Vegnagun is the single most powerful weapon ever created. It is unknown how Vegnagun would have faired in a battle with Sin, although based upon Sin's monstrous power, it seems likely Vegnagun would lose (Vegnagun's main cannon seemed capable of nuclear weapon-level force, able to destroy an area the size of the Calm Lands. However, Sin's ultimate graviton attack was visible from orbit, tore flaming cracks through the planet's crust, and was even creating a noticable gravitational pull on the moon. This implies far greater power). More importantly, however, is the fact that Vegnagun could not differentiate between friend and foe, and so, even if Vegnagun had somehow defeated Sin, it itself would have just proceeded to ravage Spira. Now, just as the Eternal Calm is beginning, a shadow from the past named Shuyin, who hates all of creation, wants to activate Vegnagun to bring destruction upon Spira. With Sin dead, no power on Spira is strong enough to stand up to an activated Vegnagun, and the ancient weapon would surely bring complete annihilation on all civilization.

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


 * Sinscales: Generic Sinspawn
 * Ammes: A Sea Anemone-like Sinspawn
 * Echulies: A Jellyfish-like Sinspawn.
 * Geneaux: A Sinspawn found at the entrance of Kilika Temple.
 * Gui: A Fusion of various Sinspawn gathered by the Crusaders for Operation Mi'ihen
 * Genais: The absolute strongest Sinspawn.