Final Fantasy 10 was the one story I had trouble understanding and it did confuse me but from what I gather is this. Yevon created the dream Zanarkand and is the reason Sin torments Spira in order to preserve it, but at the start of the story Sin attacks the dream Zanarkand therefore destroying the whole purpose of Sin's existance.
Excuse my ignorance. Played FF since the original but FF10 just confused me.
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