* MoralEventHorizon: Smiling Man did many terrible things. However, for some people the moment he crossed it was when [[spoiler:it's revealed that he killed the alternate universe counterparts of the heroes, using his own counterparts that died in the process and buried them all together in one graveyard in his home dimension]].
* NightmareFuel:
** The Sisters of the Twilight are firmly established as such in the background information (and [[Webcomic/{{Mindmistress}} the original comic]]).
** Smiling Man also fits, maybe ever more than Sisters.
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