Doctor Whooves: The Hundred Year Invasion

The Canterlot statue garden was founded 200 years after Luna was exiled to the moon.  Statues were made of many things, Princess Luna, Nightmare Moon, Discord, etc. and more statues were added constantly.  One statue shows a pair of ponies, a Pegasus and an earth pony, who are of no importance as of now.  One statue, if it may be called such, is that of the attack on Pegasopolis, or what is now known as Cloudsdale, during the griffon wars.  The ruined cloud-homes and images of sad ponies are only the exterior.  For within these statues, there is a secret hidden: a secret which has been waiting and watching for a hundred years, and now is ready to be let out.