Yunalesca Lady Yunalesca is a non - player character and antagonist from " Final Fantasy X " , who also briefly appears in " Final Fantasy X - 2 " . She was the first summoner to defeat Sin and bring forth the Calm . Profile . Appearance . Yunalesca has long silver hair that splays out around her in tendrils during battle . She wears a blue headband with four ribbons finished with blue beads and yellow tassels . The headdress has two long plumes that zigzag to make an ' M ' shape . She has yellow eyes . Yunalesca wears a blue - and - black bra with a curlicue design linked in front by a yellow chain , and a black thong , a thin yellow - tasseled belt , gold bracelets , blue armbands and wristbands , green sashes decorated with the Yevon symbols , silver anklets and a blue garter around her left thigh . She wears a blue bead necklace resembles seashells or fangs . She is barefooted . Personality . Yunalesca is frank and to - the - point . While she can be kind , she is merciless and cares only about upholding the teachings of Yevon , not hesitant to strike down those who dare to question them . Yunalesca is not open to the ideas of others , viewing Spira as doomed without the service she provides . Story . " Final Fantasy X " . Around the time her father Yu Yevon created Sin , Yunalesca and her husband Zaon were said to have escaped Zanarkand ' s destruction . Maechen speculates that motivated by her desire to protect Spira from Sin , Yunalesca provided a means to temporarily dispose of Sin in return for her father to be honored . According to the " Final Fantasy X Ultimania Omega " , however , the origins of the Temples and their connection with Yunalesca are hazy at best with no evidence Yunalesca had a direct hand in the Temples ' formation and their doctrine . " Yunalesca ' s Real Story " in the " Ultimania " states that although Yunalesca ' s vanquishing of Sin with the Final Summoning was what gave rise to the Church of Yevon , she only learned of Yevon ' s teachings through the people visiting the Zanarkand Ruins seeking the Final Aeon , and played along because she wished for the people to follow them as the philosophy of the Temples and Yunalesca ' s own had a lot in common . In fact , without the teachings Yunalesca ' s ideals would not have become widespread . Dying after using Zaon as the fayth of her Final Aeon , the unsent Yunalesca took residence in the Zanarkand Dome where she greets the summoners at the end of their pilgrimage and explains the fundamentals of the Final Summoning ; a guardian who has a strong bond with their summoner must be sacrificed to create the fayth for the Final Summoning . This tradition continued for a millennium . Summoner Braska ' s guardian , Auron , objected to such false hope but Braska ' s other guardian , Jecht , offered to become Braska ' s Final Aeon . After Braska ' s sacrifice Auron confronted Yunalesca who mortally wounded Auron . He made it far enough to trust Braska ' s daughter Yuna to Kimahri Ronso ' s care before passing away , becoming an unsent spurred on by the promises he ' d made Jecht and Braska . Ten years later , Yuna follows in her father ' s footsteps and becomes a summoner with the unsent Auron as one of her guardians . Auron seeks to avenge his comrades ' deaths and though he wasn ' t strong enough to defeat Yunalesca alone , joining Yuna ' s pilgrimage with Jecht ' s son Tidus provides him a new opportunity at this feat . The group arrives to the Zanarkand Dome and Yuna renounces Yunalesca ' s ideals once learning the truth of the Final Summoning and Sin ' s continual rebirth . Though Yunalesca attempts to put Yuna and her guardians out of their " misery " now that they have learned the truth of Yevon and the Final Summoning and rejected it , she is defeated and finds herself fading . Yunalesca curses them for dooming Spira to the sorrow of Sin while lamenting to Zaon that the world ' s last hope is gone . " Final Fantasy X - 2 " . Yunalesca ends up in the Via Infinito under Bevelle where she remains for the next two years . Without a purpose , Yunalesca becomes the fiend Chac but is finally put to rest by the Gullwings . In the International and HD Remaster versions , Yunalesca and Zaon are briefly seen in the ending of the YAU - 71 ' s fiend tale . Gameplay . " Final Fantasy X " . The party fights Yunalesca in the Zanarkand Ruins . She has three forms , the last two of which often inflict Zombie status on the party . " Final Fantasy X - 2 " . The party fights Yunalesca in her fiend form Chac at the Via Infinito . Other appearances . " Final Fantasy Airborne Brigade " . Yunalesca appears in " Final Fantasy Airborne Brigade " as an enemy during an event called " Showdown " . In battle , Yunalesca uses Mind Blast . " Final Fantasy Trading Card Game " . Yunalesca ' s boss form from " Final Fantasy Airborne Brigade " appears as an Ice - elemental card .