Set in the first year, or The Sorcerer's Stone.

Hogwarts, School for Witches, Wizards, and now… Unicorns, apparently? Sweetie Belle, in attempt to use magic with Twilight Sparkle, creates a magic blast so big it attracted the attention of Albus Dumbledore, head of Hogwarts School of Witchcraft and Wizardry. But all is not as it seems, as Sweetie had to deal with bullies, hard spells, essays (NO!), and the looming threat of Vol- You-Know-Who. And it seems he has taking a special interest in Sweetie Belle, a Unicorn. Can she survive her first year at Hogwarts?

Note: Only has a "Gore" tag because of the Unicorn Blood, and "Teen" because of the scary stuff in the looming threat of death that You-Know-Who poses to Sweetie Belle.