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* BigLippedAlligatorMoment: The ''Danse Macabre'' is an in-universe example. One day every 80 years or so (which is probably not coincidentally about once in a human lifetime), white flowers bloom in the graveyard and TheGrimReaper leads a dance between the living and the dead. Even people who are not aware that ghosts exist proceed about like this is normal, but the living cannot remember it after it happens and the dead are forbidden from talking about it with the living. Those who are not living or dead, such as Silas, cannot participate in the ''Danse Macabre'' and Bod questions him about the sheer {{BLAM}}-ness of it after he finds out that none of the ghosts will discuss the events of the previous night.
* CompleteMonster: "The man" [[PsychoForHire Jack Frost]] is the most dangerous and wicked [[ProfessionalKiller assassin]] of the [[AncientConspiracy Jacks of All Trades]], and is the main antagonist of the novel. First seen after [[WouldHurtAChild murdering an innocent child]] and her parents, Frost tries to stab a baby to death in order to prevent him from growing up to become a threat to his organization, and, when the toddler escapes, Frost nearly murders an innocent man while in his pursuit of the child. Years later, Frost returns to kill the boy, now a teen named Nobody "Bod" Owens, and, after sending his fellow Jacks after the boy, knowing they will most likely fail and die, Frost kidnaps Bod's best friend, Scarlett, and tries to kill both her and Bod for "pride in his work", at which point Frost plans to use [[EldritchAbomination the Sleer]] to remake his organization in his image and make himself all-powerful. Sociopathic and cruel, Jack Frost is a dark villain to match this [[WhatDoYouMeanItsForKids dark novel]].
* NightmareFuel: [[WhatDoYouMeanItsForKids ARGH]]. Just... GAH.
** To be more specific, the [[spoiler:part where Jack Frost is "protected" by the Sleer.]] Although there are a few more segments that could fit this trope, like [[spoiler:the fate of Nick and Maureen]]. But none are as bad as that first one.
* WhatDoYouMeanItsForKids: For God's sake, the book's first sentence is "There was a hand in the darkness, and it held a knife."
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