>>713395717What? Did you play the game?
Okay here's the abridged version of the lead up to FFX. Fayth were always a thing. Summoners were always a thing. It's just a fact of their world. Machina were always a thing too and Zanarkand was called "the machina city."
Zanarkand and Bevelle went to war. And while Zanarkand fielded Summoners to defend themselves, Bevelle fielded extremely advanced machina. And Zanarkand was losing. Hard. So hard that Yu Yevon was concerned that Zanarkand was going to be wiped off the map. Yu Yevon loved his city and refused to let it die. So they collectively did 3 things
1: the populace of Zanarkand marched up to Mt Gagazet, singing what would be called the Hymn of the Fayth. There they sacrificed their bodies to become Fayth for Yu Yevon to use
2. Yu Yevon used Zanarkand's Fayth to construct a Dream copy of Zanarkand from the memories of the populace. This Zanarkand was constructed deep out at sea where no one could find it
3. Yu Yevon used a massive amount of Pyreflies to construct armor to defend Dream Zanarkand and himself. A monster so unthinkably powerful that no one could ever stop it. This would later be called Sin
Sin was supposed to target machina aka Bevelle's forces. But the strain of creating Sin made him lose his fucking mind, so now Sin attacks anything it encounters. Hence Spira as we know it