Slowly, so slowly, something has been roaming the world of Equus and has started to kill the inhabitants. Already all of the Griffon and other Nations' populations have fallen, even the Changelings have died out. The only stronghold in this new Equus is the land of Equestria and even there its failing.
This Universe takes place where Twilight's an Alicorn but all the events actually happen when the mane 6 would be in their early teens/mid-teens, where Twilight is the same age as The Character Night Darkshroud.