So, just to clarify, in order to cut down on in-story exposition, whenever something needs explaining, I’ll have a handy-dandy Jiminy-esque entry from Twilight’s Journal. Pay Attention! Some of it will be important, and some of it will just be me wasting your time. Plz Though this one is important Sweating a little…
Twilight’s Journal Entry: Worlds
“The Equestrian Constellation: A formation of three worlds. Each world is home to one of the three main races. There is Equis, home of magic wielding Mages like Rarity and myself. Then there is Aeros, home of Avians like Rachelle and Shia and lastly, Tria, home of the Earthans like Pinkie and Jackie. Each of these worlds has an abundance of magic, resulting in it’s inhabitants having a larger amount of control and power than normal humans. According to legend, these three worlds were once united as single world known as Canterlot, but due to ‘mysterious circumstances’ the world was split into three. I suspect that my Master may know more about how or why it occurred…”