Originally Posted by
RopeDrink
Meanwhile, the First is where the Warriors of Darkness came from. They were essentially the First's equivalent to ourselves, Warriors of Light fighting in the name of Hyde, WoL's who won all their battles and quelled all threats of Darkness, and thus inadvertently caused the flood of light on their world.
As you've seen from the end of that quest-chain, Emmisary-Filia was created thanks to the light/crystals that the WoL/Scions and WoD's brought together, and thus our EmmiFilia claimed she would go to the First to stop the flood - things you can see in the new ShB E3 trailer. There is also a time-bubble of sorts seeing as events on the first have been raging for practically a century, whereas our EmmiFilia left not that long ago by comparison in our time-line. There is also a massive possibility that, yes, the previous fracturing/sundering has indeed created somewhat of a mirror of worlds (and its inhabitants), such as us meeting an NPC at the start of ShB who is practically identical to the brothers we meet when starting in ARR, or the WoD's themselves, who were carbon-copies of the NPC's you see in the 1.0/ARR Flames of Truth, even though they're not the same people, or the fact that we'll be dealing with not one, but two Minfilia's. It was also blatantly stated that what Urianger foresaw leading up to the appearance of Arbert and the WoD's was 'the future', so it'll be a little wibbly-wobbly-timey-wimey, but the most important detail is to remember that the expansion does not take place in our world.