While celebrating their victory over the Umbrum, a mysterious enemy from the distant past returns and makes a declaration of war. This enemy, long forgotten by Ponykind, wields a disturbing power that even the element-bearers cannot withstand. The task thus falls to Midnight Shard, Flurry Heart and the children of harmony to take up their parents' mantle.

(Shout out to my friend, Eeveewhite - once again, for letting me use her OC's)