Twilight Sparkle is an apprentice wizard to the famous Starswirl the Bearded, archmage extraordinaire. In his cottage on the outskirts of Ponyville, she and her familiar, the pseudodragon Spike, live in simple comfort as she learns the secrets of the arcane. But her life of quiet study comes to an end the day the sun rises late. Soon after, she is thrust into a world of danger and adventure, seeking ancient relics that can save her world. But for Twilight, the most difficult task is something else entirely - making friends.

Image: Screen capture of "Friendship is Magic, Part 2" from MLP Wikia.

A note on tags: The crossover tag is included because these vignettes, intentionally, draw a great deal from the current (fifth) edition of the Dungeons & Dragons roleplaying game.

This story is a sequel to Shadow Grave

As a rare and unusual astronomic event approaches, Twilight Sparkle's friends come to realise that something has gone very wrong with their friend.

As Twilight Sparkle contemplates an unwelcome consequence of her ascension to alicornhood, she is caught up in wider events as a grave robbery in Ponyville heralds the return of an ancient threat to Equestria.

Extended author's notes here.