When Starlight Glimmer became a student of the Princess of Friendship, she could never imagine the hardships she would have to face, her past standing indomitable among them.

Twilight Sparkle knew well becoming a teacher would mean taking the same mantle the Princess of the Sun once wore, but not the same role—there was another mask fated for her to don she didn’t expect. 

Until one of them figures out how to conquer her shadow, and another finds what is supposed to be underneath that mask, they would remain a student and a teacher forever.