An horrifiying energy gape in Tartarus breaks the magical barier between Equestria and Tartarus.Which means many dangerous creatures are free now.

Princess Luna can't control her own dreams.Both her and her sister see unexplainable images that can be signs of very perilous evil being from the past.Now they need to discover with a forgetten past can be bitter to face.
But are they ready for it?

A journey to the Equestria's origins and a golden age's end.