Night of the Shy/YMMV


 * Complete Monster:
 * Nightmare, oh so much.
 * Discord was already a borderline example in canon; according to Luna, this was him being playful, and that he was much worse when the Princesses fought against him long ago.
 * Moral Event Horizon:
 * Literally everything Nightmare does is either this or a Kick the Dog moment.
 * Discord apparently crossed it in the backstory, when he killed Celestia and Luna's parents -- he Mind Raped them so far past the Despair Event Horizon that they simply lost the will to live and wasted away.