 The creation of Spira includes distinct ethnic minorities including a portrayal of the fictional Al Bhed language that is prevalent throughout the game 's dialogue . The backstory and concept behind the dark religious themes of Final Fantasy X were a central theme to the story and their ultimate resolution was well received . The popularity of the Eternal Calm video served as the impetus of Square Enix to do Final Fantasy X @-@ 2 to make their first direct sequel in video game form and depict the evolution of <unk> society after religious and political upheaval results in new factions and instability in the world . Spira and its inhabiting characters have been featured in several other Square Enix works including Dissidia Final Fantasy , Dissidia 012 Final Fantasy and three games within the Kingdom Hearts series and Theatrhythm Final Fantasy . 
