The statue lies in the royal gardens, the statue representing the disharmony between ponies. Some say it was a representation of a creature that rampaged thousands of years ago. Others say it was somepony who ran afoul of the princesses.
Some say it would be alive.
Especially since deep in the night, the statue cries.

This is its story, its tale of how the stone would be much more of just a barrier preventing escape.
Even once it escapes its imprisonment, the statue will cry on.