In ancient times the land was once laid in forests. Ages ago mythical beings of great size inhabited and ruled over it. Back then, those beings lived peacefully with the slowly emerging pony race. But as time passed by, the pony race started to expand over the land.
Many forests have been destroyed in the process of this expansion. This act enraged the mythical creatures and friendship was replaced by hostility.
To end the hostility Princess Celestia created a great wall that seperated the "Undiscovered West" from Equestria. It all happened before the banishment of her sister Princess Luna.
But after a millenium of peaceful silence... a message reaches Canterlot about a crack in the wall. The curiosity of the small filly called Fray Leaf will lead her into the "Unexplored West" where she will meet a most unusual friend.
English is not my main language ^^ Which is why I kindly ask for forgivness if you find any mistakes in the text :)