Yuna get the final aeon and choses Tidus to become it and they both defeat Sin together Tidus ends up killing Yuna because that is what the final aeon dose and then Tidus becomes Sin. Yuna becames a fayth-Leivathan, Lulu,Wakka and Rikku all becomes Summoners they get Yuna's fayth at the Moonflow, where the water has dried up and the city that fell into the water is now ruins where the Fayth lies for the summoners,Lulualso get the fial aeon choses Kimarhi as the final aeon she dies,Sin(Tidus) dies and Kimarhi becames a fayth-Titan,Wakka and Rikku defeat sin(Lulu then Wakka) by chosing Auron and Brother as their final aeon,they die,Auron and Brother both becames fayths-Alexander and Ramuh and it never ends........