"So, Twilight, could you learn what you're lacking as my student yet?"

"I couldn't."

"…I see. It looks like you've finally reached your limits. Such an incomplete pony could never defend Equestria against what's coming. She could never defeat the fears that reside within her, either. Even if I let you leave my teachings, you'd be tormented, eaten alive by your paranoia, and eventually, someone with your magical abilities would inevitably end up…"

"…corrupted."

fwoosh

"Because of that, instead of finishing your studies and allowing you to graduate past my tutelage, ending your life will be my last duty as your teacher.

Are you prepared, my faithful student?"