History NightmareFuel / LogHorizon

* A minor example, but near the end of the final episode, it's revealed that Krusty still has Misa's severed arm with him, with the implication being that he plans to return it to her. That said, it can be rather unnerving when said arm suddenly begins ''twitching''.

* Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him in the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha is a guild master that [[spoiler: runs an entire town and bought the Cathedral, potentially forbidding any Adventurers from reviving if she chooses]], the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expresses [[FemmeFatale copious levels of seduction and danger]]. [[note]] Second season gives the aversion. The spy was an old friend of both(Kasuhiko), and he appeared to be in one piece and still spying for Shiroe. [[/note]]

* A minor example, but near the end of the final episode, it's revealed that Krusty [[spoiler: still has Misa's severed arm with him, with the implication being that he plans to return it to her. That said, it can be rather unnerving when said arm suddenly begins ''twitching'']].

** Novel is darker, she can predict most outcomes for 5 minutes(and choose the best), not 5 seconds, it is 9 seconds before her brother dies, 32 seconds after Serara used Heartbeat healing. But also not as serious as it seems, since they would have all been revived as Adventurers, sans Golden Retriever boy Rudy who is a native people of the land. Rudy tried to sacrifice himself to save the party and the town and overturned Minori's predictions.
* Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him in the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha is a guild master that [[spoiler: runs an entire town and bought the Cathedral, potentially forbidding any Adventurers from reviving if she chooses]], the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expresses [[FemmeFatale copious levels of seduction and danger]].
** Second season gives the aversion. The spy was an old friend of both(Kasuhiko), and he appeared to be in one piece and still spying for Shiroe.

** Sorry, does not apply in this case. The novel, anime and manga(different versions and spin-offs) all specified that every single player logged in was transferred to their home town(the last player town they were in) at the start of the event. Shiroe was with Minori and Touya fighting monsters before the event happened, and after a few splash scenes(of the moon server) that he cannot well remembered, he woke up in Akiba.

* Soujirou is not someone you want to be in the same room with when he's angry. Case in point, his attitude towards the SerialKiller. The formerly cute kid looks like a psychopath as he plots to take him down. It's a good thing he's a good guy, because he would make a terrifying villain.
** Think of it, he is modeled after the guy with a same name in RurouniKenshin, who IS on the bad side.
* Season 2 Episode 19. The sheer glee in which the Knights of Odyssey go to their deaths is just disturbing(ly stupid).

** Think of it, he is modeled after the guy with a same name in RorouniKenshin, who IS on the bad side.
* Season 2 Episode 19. The sheer glee in which the Knights of Oddesey go to their deaths is just disturbing(ly stupid).

* Season 2 Episode 19. The sheer glee in which the Knights of Oddesey go to their deaths is just disturbing(ly stupid).
* The fact that "transgender" players (people who made an opposite sex avatar and got stuck like that after the Apocalypse) are slowly having their personality and gender erased until they're converted into what matches their new bodies. The only thing worse than being stuck as the wrong sex is having your identity gradually being overwritten against your will.
** This troper sees it more as a combination of social pressure, the subconscious(or not) desire to conform, hormones, and simple conditioning. After all, tomboys and transmen are a thing. So while it's no longer horrifying, it's still rather frightening, knowing that you're undergoing a massive change in personality. Of course, that's always happening, to everyone, constantly, but it's generally unnoticeable. For them, it's just about impossible to miss, especially since their voices are gradually changing.

** This troper sees it more as a combination of social pressure, the subconscious(or not) desire to conform, hormones, and simple conditioning. After all, tomboys and transmen are a thing.

* The fact that "transgender" players (people who made an opposite sex avatar and got stuck like that after the Apocalypse) are slowly having their personality and gender erased until they're converted into what matches their new bodies. The only thing worse than being stuck as the wrong sex is having your identity gradually being overwritten against your will.

* Season 2 Episode 19. The sheer glee in which the Knights of Oddesey go to their deaths is just disturbing(ly stupid).

** Death not being permanent can enhance the fear effect. Because you still experience all the pain that comes with death or most of it (if you're level 90 with massive defense stats) it can be seen as prolonged, indefinite torture.

* Season 2 Episode 19. The sheer glee in which the Knights of Oddesey go to their deaths is just disturbing.

* Season 2 Episode 19. The sheer glee in wich the Knights of Oddesey go to their deaths is just disturbing.

* Soujirou is not someone you want to be in the same room with when he's angry. Case in point, his attitude towards the SerialKiller. The formerly cute kid looks like a psychopath as he plots to take him down. It's a good thing he's a good guy, because he would make a terrifying villain.

* Season 2-Episodes 4 and 5. There's a SerialKiller stalking your city. The [[CityGuards the Royal Guards do not appear to stop him]] despite the city being a safe zone. Even when DeathIsASlapOnTheWrist, this sort of thing is scary.

* Season 2-Episodes 4 and 5. There's a SerialKiller stalking your city. The [[CityGuards the Royal Guards do not appear to stop him]] despite the city being a safe zone. Even when DeathIsASlapOnTheWrist, this sort of thing is scary.

* Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him in the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha is a guild master that [[spoiler: runs an entire town and bought the Cathedral, potentially forbidding any Adventurers from reviving if she chooses]], the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expresses [[FemmeFatale copious levels of seduction and danger]].

* Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him on the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha is a guild master that [[spoiler: runs an entire town and bought the Cathedral, potentially leaving any Adventurers from reviving if she chooses]], the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expresses [[FemmeFatale copious levels of seduction and danger]].

* Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him on the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha [[spoiler: is a guild master that runs an entire town and bought the Cathedral, potentially leaving any Adventurers from reviving if she chooses]], the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expressives copious levels of seduction and danger.

* Episode 19: Minori shows off the ''Full Control Encounter'' she copied off Shiroe and how she can effectively see five seconds into the future because of it. While this is initially awesome, it takes a darker turn [[SavageWolves when the direwolves show up]]. ''Full Control Encounter'' tells her that her brother will ''die'' because the wolves reduce his HP faster than they can restore it, and without their tank, the rest of them will die, and without them, the town of Chousin will be ravaged. There's this terrible SlowMotion scene where she's desparately trying to find a way out of a tragedy five seconds in coming and comes up with nothing; dead end, game over.