It is a time of peace in Equestria. But a rising darkness will shatter that peace with it's corruption. Only the last Darkenrarg, along with the Elements of Harmony, and beings of myth and legend, can bring it to an end.
Let me give it to your short and sweet: I've not watched the show for years. I was drawn in by the fandom. As such, I might have some errors in my stories. Don't fear to point them out!