It has been one of the closest guarded secrets of Canterlot's royalty. Deep in a specially constructed dungeon, surrounded by warding spells and powerful magic barriers, exists an enigma. Within a cage that could only be described as something out of a nightmare, it waits and watches all of Equestria. A creature that cannot age, is immune to disease, does not thirst nor hunger, and resists all injury. But, it also holds secrets and knowledge that could safeguard the kingdom. Its powers are frightening, but it is civil enough for debate when patience permits.

Princess Celestia has sought counsel with the creature before, enduring it making deal after deal for its services. The Princess walks a fine line when dealing with it, knowing full well anything could give it an advantage despite its imprisonment. She has had to go back on her word in these dealings, and from this a deep animosity between them has been born. It is a necessary evil as she is convinced this is a being capable of untold evil far and above anything Equestria has ever dreamed of. So long as it remains within the confines of its cell, her kingdom is made safe. So much magic has been woven to ensure that, there is little chance of escape.

So long as the magic holds, there is no danger. So long as the cage remains strong, the nameless creature stays enthralled in his cavernous dwelling. If that were to change--if the magic failed--not even the wisest could say. But one thing is assured, it does not bode well for Equestria.

Cadence is all that's left. Her last companion made the ultimate sacrifice to ensure she could escape. Now, there is no one that was spared by the catastrophe that overwhelmed everything and everyone. Her only option left is to turn to the last pony she could imagine as an ally. Her powers useless, her hopes vanquished, Cadence must be prepared to fight for all she has left to save even a part of what remains...No matter the cost to herself. But, is it already too late?

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.