Fayth The fayth ( Original : ; International : ) are human s who willingly had their souls sealed in statues in a state of dreaming in " Final Fantasy X " . Their powers allow a summoner to coalesce the power of pyreflies to create physical forms from the fayth ' s dream , called aeons , or other magical phenomena . In the world of Spira the fayth are the souls of the people who willingly underwent a ritual that removed their souls from their still - living bodies and sealed into stone tablets . This technique of creating fayth was used in Zanarkand . When the religion of Yevon arose in the Machina War ' s aftermath a thousand years ago , summoning became one of its core dogmas and thus it became pertinent to train summoners . Many fayth were placed within the temples of Yevon where they reside within the Chambers of the Fayth , perpetually singing the " Hymn of the Fayth . " These fayth are visited by summoners on their pilgrimage who pray for them to receive the power to call forth their aeon . The fayth ' s aeon form is the physical embodiment of the fayth itself . Aeons usually embody the fayth ' s strongest emotion , e . g . in Anima ' s case pain and sorrow . Story . " Final Fantasy X - 2 . 5 ~ Eien no Daishō ~ " . Back in ancient times during the Machina War the fayth were created by the summoners themselves with the help of someone they shared deep feelings with , in a ritual implied to be sexual in nature , although it is said that is not the only way to make a fayth . The summoner and fayth must then share a mutual sympathy to summon an aeon . " Final Fantasy X " . After Zanarkand ' s defeat at the hands of Bevelle in a war that would become known as the Machina War , Yu Yevon , the ruler of Zanarkand and the most powerful summoner in the world , converted those of his people still alive into fayth and placed them on a wall on Mt . Gagazet . He used these new fayth to summon a dream world modeled after Zanarkand . With the power of the fayth ' s dream , he summoned all of the buildings and all of the people who had lived there to " preserve " Zanarkand for all time . Afterward Yu Yevon summoned an armor around himself to ensure nothing would interfere with his summoning , Sin . The strain of this was too much and Yu Yevon lost his humanity , becoming little else than a parasite that exists only to summon . Shielded by his armor Sin , Yu Yevon continually summons the dream Zanarkand , unable to stop , while Sin became a fearsome monster that went on a rampage all across Spira , destroying every machina city . Yevon ' s daughter , Lady Yunalesca , made her husband , Zaon , into a fayth to summon a powerful aeon , known as the " Final Aeon , " for the first Final Summoning . It defeated Sin , but Yunalesca died when the spirit of Yu Yevon possessed Zaon ' s aeon body , turning it into a new Sin . Yunalesca remains in the world of the living at the ruins of Zanarkand as an unsent , and awaits the summoner who makes it to her abode to create the Final Aeon from the summoner ' s guardian . If the summoner defeats Sin using the Final Aeon , the fayth within Sin is allowed to rest as Yevon jumps to the body of the Final Aeon , creating a new Sin , and enters a recuperative state . During the time Sin is absent is called " the Calm . " The religion of Yevon arose to promote the practise of Final Summoning as the only way to free Spira . To ensure the summoner ' s readiness , they embark in a pilgrimage to visit the Yevon Temples around Spira to pray for their fayth and acquire the power to summon them as aeons . The temples across Spira each house a fayth that only a summoner during their pilgrimage is allowed to visit . The Yevon faith supports Yunalesca ' s worldview , and posits that the Final Summoning is the only way to rid the world of Sin , all the while knowing the Final Aeon cannot defeat Sin permanently . Yet , the following the teaching of Yevon and revering the summoners who take on the pilgrimage gives Spirans hope to carry on their lives . According to " Final Fantasy X Scenario Ultimania " fayth can enter Dream Zanarkand for their lack of physical bodies . Fayth can only be seen and heard by people who are either made out of pyreflies ( i . e . summoned people / unsent ) or those who can summon . All the aeon - fayth frequent Dream Zanarkand and blend in with the citizens to enjoy themselves in the paradise world . All fayth share a common consciousness . This is why the fayth refer to themselves as " we . " After growing tired of a millennium of dreaming the fayth request Tidus , a person who hails from Dream Zanarkand and thus a product of their dream , to destroy Yu Yevon so they can rest . Bahamut ' s fayth knows Tidus from his trips to Dream Zanarkand , and due to the fayth ' s shared consciousness , acts as a spokesperson for all the fayth in asking him to kill Yu Yevon to stop the summoning . Tidus ' s party invades Sin on an airship to defeat Yu Yevon directly without the Final Summoning . After Yu Yevon ' s defeat the fayth are freed to enter the Farplane , but Tidus and his world disappear alongside them . From this day forth summoners are no longer able to summon aeons . " Final Fantasy X - 2 " . The fayth who had sacrificed themselves to help Yuna defeat Yu Yevon become possessed by Shuyin ' s darkness . During her journey to the Farplane , Yuna meets Bahamut ' s fayth who tells Yuna about Shuyin and how the fayth tried to stop him but were unable to . Yuna and her friends fight and defeat Shuyin , thus freeing the fayth of his influence . At the end of her journey , Bahamut ' s fayth appears before Yuna and asks if she wishes to see Tidus again . If Yuna wills it , the fayth gather Tidus ' s pyreflies into a corporeal body and send him back to Spira to reunite with Yuna . Known fayth . Each fayth has two physical forms ( not counting the aeon form ) : The spirit - like fayth , and its soul form , sealed in a stone tablet . Several aeonic forms have different names ( for example Grothia , the name for Isaaru ' s Ifrit ) , implying they are identical in appearance but separate in nature from the other aeons of similar form . Creation . Lady Yunalesca is the only one described by " Final Fantasy X " as having created the fayth after her father converted the Zanarkand residents into fayth 1 , 000 years ago . Consenting to this procedure may be a requirement , as only those offering themselves to become fayth have been known to exist . In any event , a fayth must willingly offer its aeon to a summoner , but once the fayth ' s imaginings have been summoned , the summoner can keep summoning it as long as they have the strength to do so . " Final Fantasy X Scenario Ultimania " posits the temples themselves created the fayth placed in each temple of Yevon summoners visit before traveling to Zanarkand to aid them in preparation for the Final Summoning . The summoner ' s guardian willingly allows Yunalesca to make them the Final Aeon ' s fayth , who then becomes a vessel for Sin once Yu Yevon enters the Final Aeon , using its form to build a new Sin . After the new Sin is defeated the fayth is free to enter the Farplane . The only exception would be Zaon , the first Final Aeon , who resides at the bottom of Via Infinito underneath Bevelle . The fayth predate the Zanarkand war , since Zanarkand was the long - time home of the summoners . As told in " Final Fantasy X - 2 . 5 ~ Eien no Daishō ~ " , during those days summoners created their own fayth with help of someone they shared a deep bond with , but this practise faded after the rise of Yevon as the dominant religion in the world . Summoners summon aeons , which are themselves associated with individual fayth . The " Dream of the Fayth " is a different manifestation performed by the fayth created from the Zanarkand survivors who allowed Yu Yevon to make them into fayth . It is to be assumed the fayth are at least as old as the existence of summoning itself . The fayth are different from spirits as they are in a state of dreaming , tied to Spira because of Yu Yevon and even after departing for the Farplane their aeons could be used in Spira by Shuyin . Tidus was conscious enough on the Farplane to whistle at Yuna when she was there , so it is possible that Farplane dead merely have a different type of consciousness . Etymology and symbolism . " Fayth " is an obsolete spelling of the English word , " faith " . It is believed to be an intentional use , giving religious undertones to the fayth , who are referred to as " children of prayer " in the Japanese . The Siddham Sanskrit script , which is the basis for the script of Yevon in " Final Fantasy X " , is used in Japan mostly by the Shingon School of Buddhism that draws on early Hindu traditions . One traditional concept is that deities manifest their thoughts or spiritual energy in the physical world on several different " wavelengths : " Sound , Form , and Symbol . The form through which a deity can manifest is an anthropomorphic representation that is not the deity itself , but a living form humans can apprehend . The form physically expresses the deity ' s essence in the same vein the aeons represent the fayth ' s dreams rather than their temporal bodies . In some Hindu and Buddhist practices one can invoke a deity through the physical representation of a statue , similar to the link between aeons and fayth . The fayth also sing the " Hymn of the Fayth , " which may represent the " sound " part of the different ways deities manifest in the physical realm in Shingon School of Buddhism .