This, however, is only a temporary fix, as Sin will resurface 10 years later, because a being known as Yu Yevon, the summoner who was the city the Church of Yevon's patron 'saint', uses the Fayth to create a new Sin, which acts as it's armor. It is said that the only way to defeat Sin is to turn someone into a Fayth, and have them attack Sin. It appears in many places in Final Fantasy X, sometimes paired with the letter A, the symbol of Yu Yevon, symbolizing the beginning and the end of everything. Sin is even represented by the letter Z in the Yevon script alphabet.
By following the teachings of the religiously-crooked Church of Yevon, the people of Spira believe one day they will atone for their crimes and Sin will vanish. It was named by all of the people of Spira who believed the beast came into being as punishment for their ancestors relying on machina and becoming a hedonistic society. This malevolent creature wreaks havoc on the world of Spira. Sin (シン, Shin) is a gigantic, demonic whale-like monster and the central antagonist in Final Fantasy X.
Sin is our punishment for letting things get out of hand.
