The Math Chest.

                                         Now! Onto MyRainbowDash's AWESOME BACKSTORY!!! (I lied, it isn't awesome, it's quite silly)

So far, MyRainbowDash has been demolishing Flying records left and right, to the point of being all of Equestria's fastest flier.

With countless awards won, and records destroyed, Rainbow Dash has been wondering, "What's next? I want a challenge! I want to push myself further than ever before!" eventually, some unicorns came to her claiming they had magic to enhance pegasi to fly faster than her, but it has never prevailed against her, many Pegasi and Unicorns alike have become far Jealous of her records, so many Unicorns go together, to charge their power to temporarily open up a rift, to a new Dimension, as one expects, it takes quite a lot of energy, and it's experimental, but they told Rainbow Dash one thing she couldn't resist- A chance for a greater challenge, things even she fails at. With such a promise, Rainbow Dash didn't hesitate to say, "Open the portal, let's do this!" To which the group of Unicorns smirked, knowing this would get rid of her, they opened the portal, taking much energy, but Rainbow Dash did what she does best- to dash. And she went through the portal.. To a new Galaxy, a new Dimension, a new everything... And thus is the story of MyRainbowDash.