All constructive criticism is apreciated (be as harsh of a criticue as you can be, I want to see where I can improve.)

The term Human, refers to a legendary creature thats only in fictional writing. Or that is what is beleived. One day when the elements of harmony are giving the CMC's class a tour in the city. A legend that has been put to rest for over 20,000 years comes back. First Nightmare Moon then Discord. Now Celestia's nightmare is coming back to life, but is she correct in her thinking. Is this "new" creature a threat or is it a friend?