[Following along, Yuna rolls her head around, watching the skyline in amazement. She barely hears the question, but when it registers, she turns to him and shrugs.]

It’s what Summoners do. We go on a pilgrimage to each temple in Spira, and pray to the Fayth. A…spirit, I guess you could say. When we do that, the Fayth teaches us how to summon an Aeon, which we are supposed to use to fight and defeat a monster that we call Sin.