It was an ordinary day in Ponyville, and even more so in the Golden Oaks library as Twilight and Spike re-shelf all of the books. Through magic fire, Princess Celestia has a sent to Twilight a new book and letter, instructing her to learn from the rather old tome.

Eager to learn new magic, Twilight set herself to reading the tome, and immediately tries to perform the first spell, believing it to be a variation of her teleportation spell. However, the spell backfires on her in a big way, and sends her sailing into the void.

When she wakes up from her unexpected journey, she finds herself in a new a place she's never seen before, and looks around to find any other ponies. She's unaware that her presence has alerted something beyond her vision, something very, very dangerous. How will she handle the monstrous creatures that lurk beneath the earth under her hooves, and will she live long enough to make new friends?