Nightmare Fuel / Gift From the Princess Who Brought Sleep

• Margarita's inner monologues describing her plans to poison children and recounting the deaths of those she's already killed display her sociopathic detachment, followed by a glimpse into her state of disconnect and confusion when trying to recall basic facts from her childhood, all the way to her final deranged entries where she simply repeats "I am the Sleep Princess" over and over.
• The fourth member of Pere Noel: Fourth Shadow, Mayrana Blossom. She and Julia are the co-founders of Pere Noel, and Mayrana is obsessed with Julia, to the point where she had Seventh Magician use the Venom Sword to make her look almost exactly like Julia and act as Julia's decoy. There's an illustration of her maniacally gesturing at the writing all over her walls, taken from a very tense moment in the novel when Elluka and Gumillia confront Mayrana in her own home, upon which she reveals that the Room Full of Crazy is the result of her writing runes all over the house in order to specifically seal Elluka's Magic Music powers. A battle results in which Mayrana demonstrates terrifying use of fire magic, and very nearly defeats Elluka and Gumillia.
  • And how she is defeated in the battle just makes it even worse. Gumillia forces her outside, into a bed of greeonian plateau roses (which are the same plant from which the Gift poison is derived), and uses plant magic in order to make the roses rip her body apart with their thorns so violently that she resembles the foliage surrounding her. Dear Held, Gumillia can be horrifying.
• After Margarita's suicide, the audience learns that Margarita's entire existence is a lie - she's been dead since infancy, and the girl we've been watching this whole time was a doll named Eve Moonlit, who used a powerful illusion on everyone it came in contact with to appear as Margarita. And it's not the first time that viewers or characters are deceived this way - Mikulia died while giving birth to her son, prompting Eve to take over, and the audience doesn't learn what happened to the real girl.
  • The illustration of the reveal scene has Elluka's hands on the doll's neck as it placidly smiles up at her, while an illusion of Eve's face laughs maniacally.
• From the novel's bonus story, there's something disturbing about having a casual conversation with a man who's holding up a severed head. Granted, he needed the head so Seventh Magician could make his face look like the right one, but still.