Celestia finds herself ill, poisoned due to a promise she couldn't keep, a secret she refuses to share. The cure to her condition is found within a living, breathing body that was left buried long ago, now brought beneath the sun's light.

Now the past is literally staring down her every step. Memories she fought to the back of her mind now freeing themselves, emotions she'd exiled now returning and giving their own edicts. Just how many secrets has she kept from her citizens, her sister, and ever faithful student? Can she keep her throne and the truth in order?

Or shall the goddess fall from grace and become the fifth and final "Terror" Equestria will ever face?