Non-mature

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  Equestria's Twilight This is the story of the end. This is the story of the death of Equestria. by Sapidus3 140,052 words · 1,019 · 27
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  Rites of Ascension Twilight makes a new spell and starts the gears of fate with her ascension to alicornhood. (Writing started before Season 3.) by CvBrony 699,646 words · 3,059 · 79
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  Withdrawal Twilight has developed a taste for stealing magic. by Raugos 85,266 words · 1,687 · 32
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  Then Tomorrow Came Twilight falls for Rainbow Dash but finds herself on the wrong end of a love triangle. by PonyAmorous 50,224 words · 673 · 58
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  The Quest A brave stallion goes on a quest to save the world by finding a lost princess in an enchanted forest. Things don't work out as he planned. by iisaw 11,578 words · 675 · 20