Twilight makes the discovery of a log written during the founding days of Canterlot by a soldier fighting in the Royal Army. What she learns as a result is more than she could of possibly bargained for.

Fluttershy and Rarity fall into a complex situation where their assistance is direly needed--they must save Marelantis before it disappears off the face of Equestria along with the legacy of the Unicorns, but the journey isn't as easy as it looks.