Equestria has enjoyed years of peace and prosperity under Celestia's reign, kept strong by the combined power of the Elements of Harmony. They passed to Twilight Sparkle and her friends, in hopes that the strength of their friendship would be able to keep them and the kingdom safe. For a time, it was enough, but recent events have formed undeniable cracks in the once unassailable friendship, cracks that a determined enough pony could break open.

How long can a kingdom stand if its foundations fall?