The origins of Sombra, Cadance and Chrysallis,as well as Nightmare Moon, are about to be revealed. The Crystal Empire, 1000 years ago. The Empire is attacked by an yet unknown pony species with an ability of changing shape. In the same time the wedding of a unicorn and the Queen is close, and everypony is afraid for the Queen's safety. But neither they or the Queen know about a trick right in their sleeves…Which will at last lead to the destruction of the wole Empire.