Via Purifico Via Purifico is a dungeon and an unrevisitable location located below the city of Bevelle in " Final Fantasy X " . It is intended as a place for prisoners to be left to die . After the two separate parties defeat Isaaru ( Yuna ' s party ) and Evrae Altana ( Tidus ' s party ) and escape the deathtrap , they can never again return to the labyrinth . Story . Yuna ' s guardians invade the wedding ceremony for her and Seymour , but they are quickly ambushed and threatened with execution if the ceremony does not continue . Although the two are wed , a diversion is made when Yuna escapes to Bevelle Temple with Valefor , her guardians quickly following . After Yuna is found in the Chamber of the Fayth , the party is arrested and put on trial . The trial reveals the higher echelons of the Yevon order to be engaged in a deception of their subordinates and the people of Spira . Yuna and her guardians are found guilty of treason for killing Maester Seymour and conspiring with the Al Bhed to cause an insurrection . They are imprisoned and sentenced to the Via Purifico , where they are split into two different sections . Tidus , Wakka , and Rikku are left to fend for themselves in the underwater sewers , while Yuna , Lulu , Kimahri , and Auron are left scattered in an underground labyrinth . It can be inferred that each person was led to his or her sentence individually and without any knowledge of the others ' whereabouts , as shown with Tidus when he finds Wakka and Rikku . In the underground labyrinth , Yuna gathers Lulu , Kimahri , and Auron as they gradually find the exit . However , they find Isaaru guarding the path , as he was assigned to " deal with the traitors " should they attempt to escape . Yuna bests Isaaru in a battle between their aeons , forcing him to reveal the exit to the surface . In the underwater sewers , Tidus , Wakka , and Rikku search for the exit , all while encountering fiends and the undead Evrae Altana . They , too , reach the surface and the party is reunited on the Highbridge . Quests . Separated Party . Yuna must find her scattered companions in the dungeon , by finding Kimahri , Auron , and Lulu . Afterward , she must activate a teleporter to find her way out . Of the scattered party members , only Auron is required to be found . Finding Kimahri and Lulu is completely optional . Should the player fail to locate them , they will automatically be recruited back into the party once the party reunites on Bevelle ' s Highbridge . Once the party reaches the end of the dungeon , Yuna will be forced to face Isaaru in a battle of aeons . She and her party are allowed to exit after he is defeated . This is the only time in the game someone other than Tidus is the onscreen leader . Sewer Navigation . Tidus , Rikku , and Wakka must navigate the sewers and use floodgates to their advantage . They must fight the unsent form of Evrae as a boss before they can finally find their way out . Shop . Appears only in the sewer portion of Via Purifico close to the save sphere ( looks like an Al Bhed treasure chest ) . Music . The music that plays in Via Purifico is called simply " Via Purifico " . In the HD Remaster , " Via Purifico " is replaced by the piano version .