History YMMV / HorusHeresy

* CompleteMonster: Erebus and Kor Phaeron kicked the whole thing off. See [[Monster/{{Warhammer}} here]] for details.

** Tarik Torgaddon and [[OnlySaneMan Hastur]] [[WhiteSheep Sejanus]] have a large following, the latter more puzzling because for 99% of the series, he's TheGhost.

** Ancient Rylanor thanks to his short story and the [[https://www.youtube.com/watchv=X2Hb4bngxJ8&ab_channel=StringStorm%E2%80%8C popular fan-song retelling of it]]. He's best known for flipping off Fulgrim so hard that it permanently damaged his pride and managing to redeem Chaos Marines with his unbreakable faith in the Emperor.

* CommonKnowledge: Lotara Sarrin is a blonde (as can be seen from [[https://static.wikia.nocookie.net/thehorusheresylegions_gamepedia_en/images/c/c4/1-Lotara-Sarrin-Imperial-Army.png/revision/latest?cb=20190918004143 her card]] in ''VideoGame/TheHorusHerseyLegions''), yet fanart overwhelmingly portrays her as dark-haired.

* ArchivePanic: Well, according to the [[https://wh40k.lexicanum.com/wiki/Horus_Heresy_Series series' 40K wiki page]], as of May 2023 there are:

** The Siege of Terra (set after the main series) has thus far seven and a half (the final book has been split into two volumes) novels and three novellas.

** Where to even ''start'' with Erebus? Helping to turn Lorgar? Corrupting Horus? Arranging the Drop Site Massacre? Killing Argel Tal? [[spoiler: Murdering Garviel Loken just as Abaddon was considering a HeelFaceTurn]]. Right from the beginning as it turns out: Erebus isn't even his real name. He murdered a popular and kind hearted young boy training to be a priest and stole his identity to secure himself a place in the theocratic class.

** Where to even ''start'' with Erebus? Helping to turn Lorgar? Corrupting Horus? Arranging the Drop Site Massacre? Killing Argel Tal? Rright from the beginning as it turns out: Erebus isn't even his real name. He murdered a popular and kind hearted young boy training to be a priest and stole his identity to secure himself a place in the theocratic class. [[spoiler: And now murdering Garviel Loken just as Abaddon was considering a HeelFaceTurn]].

** Where to even ''start'' with Erebus? Helping to turn Lorgar? Corrupting Horus? Arranging the Drop Site Massacre? Killing Argel Tal? Rright from the beginning as it turns out: Erebus isn't even his real name. He murdered a popular and kind hearted young boy training to be a priest and stole his identity to secure himself a place in the theocratic class. [[spoiler: And now murdering Garviel Loken just as Abaddon was considering HeelFaceTurn]].

** Where to even ''start'' with Erebus? Helping to turn Lorgar? Corrupting Horus? Arranging the Drop Site Massacre? Killing Argel Tal? Rright from the beginning as it turns out: Erebus isn't even his real name. He murdered a popular and kind hearted young boy training to be a priest and stole his identity to secure himself a place in the theocratic class.

** Did the Emperor of Mankind recruit Erebus and Kor Phaeron because he FailedASpotCheck despite they're obviously chaos-worshiping maniacs, or is he playing 4D chess and keeping them on purpose because he knew the Horus Heresy will happen so he's recruiting them to kickstart it?

** Where to even ''start'' with Erebus? Helping to turn Lorgar? Corrupting Horus? Arranging the Drop Site Massacre? Killing Argel Tal?

** "Magnus did nothing wrong" has become a meme among Thousand Sons fans and is often ironically repeated by other people right before they point out all the stuff that Magnus did, in fact, do wrong.

* QuestionableCasting: Most of the narration of the audiobook for ''The Lightning Tower'' is perfectly good, with the exception of Rogal Dorn; he's given a weird nasally voice that makes him sound nothing like the regal, imposing figure he's meant to be.

* BeamMeUpScotty: Lotara Sarrin is a blonde (as can be seen from [[https://static.wikia.nocookie.net/thehorusheresylegions_gamepedia_en/images/c/c4/1-Lotara-Sarrin-Imperial-Army.png/revision/latest?cb=20190918004143 her card]] in ''VideoGame/TheHorusHerseyLegions''), yet fanart overwhelmingly portrays her as dark-haired.

*** ''Echoes of Eternity'' has proven similarly divisive, with reactions ranging from praise to outright FanonDiscontinuity. The biggest complaints seem to be continuity (with detractors accusing Dembski-Bowden of [[ContinuitySnarl not bothering to read the rest of the series]] and/or [[ArmedWithCanon retconning things that he didn't like]]) and alleged [[invoked]]CharacterDerailment (mostly involving Magnus and Angron). There's also the presentation of the story; many fans, even those who like the novel, have stated that it would've been better as an anthology, because it can feel like a RandomEventsPlot at times– but this isn't universal either, as some believe the stories were woven together well enough to work even if they're largely disconnected from one another. One thing that everyone seems to agree on is that the book needed more proofreading, with it containing several minor errors[[note]] Like calling Dorn "the Fourth Primarch"– he's the Seventh, the Fourth is Perturabo, his big rival[[/note]] that can be quite distracting.

* DesignatedHero: Even before the actual Heresy and before any Space Marine had fallen to Chaos, many of the actions undertaken by the primarchs and the expedition fleets were... questionable, at best. Fulgrim and Ferrus Manus's ruthless extermination of the Diasporex, a democratic confederacy where humans and aliens lived in peace together and only wanted to be left alone, simply because the humans co-operated with xenos and refused to join the Imperium, is probably the best example.

** [[WouldHurtAChild Vulkan/Salamander vs Eldar child]][[labelnote:Explanation]]In ''Vulkan Lives'', the titular character, usually considered to be [[NiceGuy the nicest Primarch]], immolates a completely defenceless Eldar juvenile. The incident, often replacing Vulkan with "a Salamander", is commonly brought up in response to discussion or portrayals of the Salamanders as {{All Loving Hero}}es, as a reminder that they are, in fact still Grimdark warriors of the Emperor. However, it's worth mentioning that Vulkan did this because he was [[UnstoppableRage really angry]] after he thought his personal Remembrancer had been killed by the Eldar (when they had in fact been "[[UnfriendlyFire accidentally]]" hit by the Night Lords), and [[MyGodWhatHaveIDone regretted it afterwards]].[[/labelnote]]