Retro Magick

She is a alien from outer space! Who was placed on earth in ponyville to study the pony ways so her kind could live here in harmony with them.
Her presence is known (she is openly out as a alien to everyone) and even though Twilight is no longer the princess in the 2nd universe she is still studied by her!
Also her blood is light blue and glows/ glows in the dark! (Her eyes and scar on her chest and ears glow faintly)