In the aftermath of her battle against Tirek, Twilight Sparkle is unwell. She wants more. She needs more. And she is afraid of what others might think of her.

But even in the midst of her growing despair that she has betrayed everything she stood for, she learns something about friendship and what it means to be an alicorn.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

Rarity, Rainbow Dash, Applejack, Pinkie Pie, and Fluttershy were brought together by Twilight Sparkle and the magic of friendship and have had incredible experiences. But now they are trapped in a world they don't understand-Equestria. How will these five normal human girls deal with such dangers as dragons, minotaurs, parasprites, -and perhaps the most dangerous of them all,- themselves?

Art Source: http://demoncat8.deviantart.com/art/Eqg-In-Equestria-Cover-392108298

NON CANON with Season 4 and EQG 2.