A tome hidden in the vast Libraries of Canterlot is found by Twilight Sparkle, who discovers it written in a language she has never come across before. Determined to solve this new found mystery she takes to spending restless hours in its translation, and in doing so is entrusted with a story long since forgotten. Soon she finds that what she thought was a simple story could be very real, and the power it tells of just as terrifying to imagine. The true beginnings of the entire world, arcane powers... and a seal with warnings written into the very magic it contains.

But, when Canterlot is put in grave danger, Twilight must make a hard choice. She must either let all she knows burn, or unleash a force more ancient than she can even imagine.