The mane six has been friends forever and ever and ever- ever since Twilight came to Ponyville. And, they know that if they're split, the elements of harmony is no more right? Discord's back to mess that all up.

Discord wins- the round for now. The ponies are all separated, no longer friends. But Twilight's not going to fall into the dead pit; she's going to fight- fight to sacrifice her friends "no more".