{{Eldritch Abomination}}s in {{Literature}}.

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* The Great Old Ones (most famously Cthulhu) in the writings of Creator/HPLovecraft (and the [[Franchise/CthulhuMythos Mythos]] they spawned) are the TropeCodifier and, to a certain extent, the TropeNamer; "eldritch" was an adjective much favored by Lovecraft, [[http://cthulhuchick.com/wordcount-lovecraft-favorite-words/ occurring 23 times in his work]]. This trope probably wouldn't exist in any significant form today if it weren't for him. Usually divided into three groups (the distinction is mostly created by later writers, but it is present in Lovecraft's own work to some degree):
** The Great Old Ones, which are immensely powerful beings made not wholly of flesh and blood but of something that can only be called matter in the most basic sense. They traveled from world to world [[WhenThePlanetsAlign when stars were right]], but now sleep, waiting until the stars are right once more so they may rule again (incidentally, when they wake up, they plunge the world into madness and terror). Cthulhu is one of them, and although human cultists call him a god he is actually just his race's HighPriest to the Outer Gods.
** The Outer Gods (Lovecraft referred to them as the Other Gods), which exist outside our universe and seem to be embodiments of various cosmic principles. They are ''far'' more powerful than even the Great Old Ones and seem to be responsible for the creation of our universe (as well as other ones), albeit unwittingly. The most famous ones are the mindless leader Azathoth, the "Blind Idiot God" who resides in the center of all infinity, and Yog-Sothoth, who exists simultaneously in every point in space and time. Their soul and messenger is the Crawling Chaos Nyarlathotep.
** The Elder Gods. Lovecraft only used one of these deities (the rest are created by other authors, namely August Derleth, as is the term "Elder Gods"), namely Nodens, Lord of the Abyss. Nodens appeared in a humanoid form (whether this is his true form or one he took in order to not drive mortals insane is unknown) and was an enemy of Nyarlathotep (and thus somewhat beneficial to humans, who Nyarlathotep wants to wipe out). Derleth made Nodens the head of a pantheon called the Elder Gods, who were mortal enemies of the Great Old Ones (although some stories seem to place them at the same power level as the Outer Gods). In Derleth's works, the Elder Gods were good and the Great Old Ones evil, which doesn't really fit with Lovecraft's cosmology. Most other writers who have used them make them somewhat benevolent to humans, but only because they want to keep the Great Old Ones asleep, which is also what most humans want to do (what with them destroying the world when they wake up and all).
*** Lovecraft did use Hypnos, but its nature (or existence) is unclear thanks to UnreliableNarrator.
*** Some mythos stories suggest that the Great Old Ones or their spawn were responsible for the creation of mankind, leading to frequent descriptions of creatures of whom the most horrifying thing is that there is something "[[UncannyValley damnably human]]" in their appearance.
** Lovecraft codified the language used to describe these things: "eldritch", "gibbering", "squamous[[note]]scaly[[/note]]", and "rugose[[note]]wrinkly[[/note]]" and such.
** There are also many species of lesser abominations in the mythos, some independent (like the Flying Polyps) and some subservient (like the Nightgaunts) towards the above God-Things.
** While not necessarily capable of driving people insane by being observed, Lovecraft has also created a few truly bizarre aliens, like the Elder-Things (''not'' to be confused with the Elder Gods), Mi-Go (described both as crustaceans and fungi, coming to Earth from Pluto but originally from another universe), Shoggoths (literally a BlobMonster capable of changing its form to any shape convenient, once used as servants to the Elder-Things to create their massive empire before also being its downfall), and probably best of all; an alien so bizarre, so incomprehensible, [[TheColourOutOfSpace that it can literally only be described as a "colour", and a colour the likes of which has never been seen on Earth at that.]]
* The "spirits" in Anne Rice's ''[[Literature/TheVampireChronicles Queen of the Damned]]'' seem to be a cross between this and [[EnergyBeing energy beings]]. Unlike ghosts who are the souls of the dead lingering on Earth for various reasons, the spirits are said to never have been human at all, they are [[InvisibleToNormals unable to be seen by people who do not interest them]] and even those who can communicate with them are often unable to see them. They are described as being enormous enough to fill the sky and one character who witnesses them describes them as being similar to fire, unable to really define its shape in terms the human mind would understand. They are, however, a far more benevolent version of this trope than usual, despite possessing BlueAndOrangeMorality, except for [[spoiler: Amel who created the vampires]] and even he was more StupidEvil than anything else.
* The never-seen-and only [[TakeOurWordForIt very obliquely described]]-Todal in Creator/JamesThurber's ''Literature/The13Clocks''.
* The [[NamesToRunAwayFromReallyFast "Cold Thing"]] from ''[[Literature/ABootStompingAHumanFaceForever 10 A BOOT STOMPING 20 A HUMAN FACE 30 GOTO 10]]''. Whatever it is is so alien that even part of it begins warping physics locally, and its presence terrifies even [[spoiler:[[TricksterArchetype Jim]] [[PhysicalGod freaking]] [[TheDoors Morrison]]]]. To further the creep factor, it only communicates with [[spoiler:[[CreepyChild some autistic kids]]]], and on its last encounter with Earth millennia ago, it left [[spoiler:an egg,]] [[spoiler:[[OhCrap which the villain plans to smash to get its attention.]]]]
* Inverted in the [[http://en.wikipedia.org/wiki/Blade_of_Tyshalle#The_Blind_God Blind God]] of ''Literature/TheActsOfCaine''. It is as impersonal, awful, powerful, and horrifying as anything from the [[Creator/HPLovecraft Lovecraft mythos]]. The inversion is that it's not really alien. Played straight with the Outer Powers worshipped by the Black Knives in ''Caine Black Knife''.
* ''Literature/{{Animorphs}}''
** Crayak, and his [[TheDragon dragon]], the Drode.
** Whatever it was that messed with Jake in Book #41, and "The One" (possibly the same being) in Book #54.
** Father, in The Ellimist Chronicles.
* Mother from ''Literature/{{Argo}}'' is essentially a robotic version of this.
* Grendel from ''Literature/{{Beowulf}}'' is often regarded as an OlderThanPrint example.
* In the ''Franchise/{{Bionicle}}'' series by Greg Farshtey, there is a character called Tren Krom who was so horrifying it would drive you insane to look at it. It is a crimson blob with hooked tentacles.
* The Eidolons from ''Literature/BitterSeeds'' are essentially sentient (and malevolent) chunks of the universal substrate.
* Rorschach from Creator/PeterWatts's book ''Literature/{{Blindsight}}'' is an intelligent, city-sized, incredibly scary ''vessel''. Its "inhabitants", the scramblers, are one of the best examples of [[StarfishAlien Starfish Aliens]] in fiction. [[spoiler: To expand on that: the scramblers are incredibly intelligent (their bodies are about 30% nerve tissue, and it can all be used for processing power) but non-sentient. Even their "retarded children" can think circles around the most intelligent human ... but they have no concept of individuality or the "self". Just think about that for a while.]]
* Wyrm from ''Literature/TheBookOfTheDunCow'' is one of these. He is a creature that takes the form of an enormous, unspeakably ancient serpent, and was [[SealedEvilInACan trapped underneath the Earth]] by {{God}} himself. While this limits him, he can still communicate [[DreamWeaver through dreams]] and [[ManipulativeBastard corrupt others to try and gain his freedom]]. His "son" Cockatrice is implied to be a weaker, but similar, being.
* Creator/TerryBrooks's various works are full of them, thus;
** The Mist Wraith, a swamp-dwelling tentacle monster.
** The creature encountered in the Wolfsktaag in ''Literature/TheSwordOfShannara'', which was a composite of machine and monster flesh. It is likely that this is the prototype for the Creeper that appeared in later books.
** The Maelmord, a living valley of toxic plant life created by the Ildatch to protect itself.
** The Creepers, created by the Shadowen, were, again, creatures of composite machine, insect, and mammal.
** The Morgawr. A warlock of disputable origin, humanoid but with scaly skin and shapeshifting properties, apparent immortality, and other powerful magics, including [[spoiler: the power to reach inside human skulls and tear out the part of the brain that the soul was anchored to and then eat it, this being how he survived.]]
* The Swarm of Night of ''Literature/TheChathrandVoyages'' is what happens when this trope meets HordeOfAlienLocusts. An innumerable horde of tiny black insect-like spirits, its purpose is to patrol the borders of the underworld to prevent the dead from troubling the living. When released into the living world, however, it's drawn to massive killings (like mass battles) in progress, finishes them (by killing everyone there who's still alive) and drawing energy from that to increase its size. Once it reaches critical mass, it can- and ''will''- eat a whole planet. [[spoiler: The BigBad released it to do just that, since the destruction of a world was the test his GodOfEvil patrons demand of any mortal to be judged worthy of elevation to their number]]. Still, the Swarm is explicitly not evil- just something that should never, ''ever'' enter the living world.
* In ''The City and the Stars'', Creator/ArthurCClarke gives us the Mad Mind, an artificially created disembodied intelligence with near-godlike powers, whose creation goes very wrong. So terrifying is it that humans create another one (and do a better job this time) in order to (hopefully) stop it. Humanity is trapped between Scylla and Charybdis on a grand scale: the conflict between the two might destroy the entirety of creation, but implicit in the decision to create the second being is that what the Mad Mind will do if it makes its way back to inhabited space, or remains unchecked for a sufficient length of time, is ''worse''.
* The works of Creator/CliveBarker frequently include Eldritch Abominations.
** ''The Great and Secret Show'' references a hidden world whose very proximity to ours causes [[GoMadFromTheRevelation millions of lovers to commit suicide]]. It is also a world of [[AlienGeometries non-Euclidean physics]].
** Rawhead Rex is an abomination that personifies the male sex drive as a living and malicious organism.
** Worshipping and appeasing such a thing is the true purpose of [[spoiler:the degenerate, immortal cannibals in ''TheMidnightMeatTrain'']].
* The passageway between the worlds in ''Literature/{{Coraline}}''. At first seeming to be a relatively normal, if strangely unsettling hallway, by the end, it's a wet, furry... '''''thing''''' that's very much alive and incomprehensibly vast and ancient. It makes The Other Mother look trivial, and she's a particularly nasty [[TheFairFolk fairy]].
** It's also implied that it's far older and more powerful than her, and that, even though she found it and temporarily used it, ''she has no goddamn idea what it is or how it works''.
* Creator/RobertEHoward's Literature/ConanTheBarbarian ran into some (Howard ''was'' a friend and correspondent of Lovecraft...). As in "Literature/ThePoolOfTheBlackOne" where he prudently made the right choice in RunOrDie.
** "Literature/TheTowerOfTheElephant", another Conan story, gives us Yag-kosha and manages the impressive feat of turning one of these into ''TheWoobie'', with the utter hell that this creature was put through for centuries at the hands of a particularly sadistic EvilSorcerer, who he calls a "devil in human form" with ''very'' good reason.
** In "Literature/BlackColossus", said colossus has a truly horrific crush on the princess.
* Creator/KimNewman's ''Literature/DarkFuture'' novels feature appearances by Azathoth, Nyarlathotep, and some unpleasant beings from beyond human reality like the Jibbenainosay: a dark spirit which usually manifests as a sort of giant, evil jellyfish.
* Creator/TerryPratchett's ''Literature/{{Discworld}}'' novels have plenty, even though, for some reason, people there [[RunningGag keep thinking that]] "eldritch" means "oblong".
** Throughout the novels, but especially the early ones, a constant danger of the use of magic is that of accidentally opening a rift into the "Dungeon Dimensions", regions with "very little reality", inhabited by nightmarish Lovecraftian monstrosities that crave the reality that those in more solid universes take for granted. They tend to try to invade the Literature/{{Discworld}}'s universe in the vain hope of becoming more real themselves, "with the same effect as the ocean trying to warm itself around a candle." The Dungeon Dimensions don't actually have form; the reason that they look like an incomprehensible mass of tentacled horrors is because when they ''do'' acquire some substance by coming close to the real world, they're terrible at it. This does not make them any less terrifying.
*** At a physical level, in the Dungeon Dimensions the Things are so weak that a small child can destroy them with a sharp push, and drive them away in sheer terror of her when she keeps doing it. This also doesn't make them any less horrifying.
*** The old dark god Bel-Shamharoth is sometimes presumed to be one of the very few aforementioned creatures that found a way to survive, sort-of, in the real world.
*** There are other "old dark gods" of the Discworld, too. Ponder is revising for an exam on them at the start of ''Discworld/MovingPictures'': he mentions Yob Sodoth and Tshup Aklathep, Infernal Star Toad with A Million Young. ''VideoGame/DiscworldNoir'' introduced Nylonathotep and makes reference to other dark gods, including Drunken Cthubopalulu.
*** There's also Dagon (cf. the Franchise/CthulhuMythos), according to ''The Folklore of Discworld'', although it's otherwise only mentioned in the anecdote about someone trying to set up a sushi bar on the site of an old temple on Dagon Street during the solstice. ([[NoodleIncident This did not end well.]]) ''Folklore'' also mentions that the Things may have been some manner of dark gods before they were exiled from existence. In ''Discworld/MovingPictures'', it is mentioned that Dagon used to be worshipped in the city that was there before Ankh-Morpork, which covered all the way from present day Ankh-Morpork to Holy Wood; the city is gone, something to do with the Things awakening. It also had something to do with [[Discworld/{{Jingo}} Leshp]] which sank, and rose, and sank, each time settled by different people. Though there are a lot of pictures of squid and there are slithering sounds and the earliest buildings look like people tried to make sense of geometry they did not fully understand.
** The Eldritch Abomination in ''Discworld/ReaperMan'' is ''not'' from the Dungeon Dimensions for once, but a result from the Auditors canning the too-amiable Death. They start off as objects that people would collect and forget about, specifically as snowglobes. These snowglobes would "hatch" into useful, traveling objects (shopping carts), that then collect people into the enormous monster-queen-THING that turns out to be a SHOPPING MALL. It's funny, yeah, but also ''terrifying''. Just think of all the shopping malls you've ever been in where you could be anywhere in the world for all the difference it makes, absorbing your time without you realizing it, being herded about like cows. Brr.
*** Then there's the ''other'' Eldritch Abomination in the same book: Azrael, the Great Attractor, ''the Death of Universes'', the being of which all other Deaths are mere reflections, who keeps the Clock, of which all other clocks are mere reflections, which ''tells time what it is''. Death travels to ask a boon from Azrael, and we get treated to a shift in perspective as the hilly landscape Death is standing in suddenly shifts, as the view zooms out, to an open hand.
** Pratchett also won't let us forget that "eldritch" and "[[HumanoidAbomination elven]]" have the same linguistic root[note]perhaps; some etymologists suspect that it comes from ''el-'' "other" + ''rice'' "kingdom" instead of from ''ælf'' "elf" + ''rice''; in either case it would mean otherworldly[/note].
** The Things have not appeared for a long time due to the themes of the series moving on. However, in ''Discworld/ThiefOfTime'', we see statues of them in the History Monks' gardens -- and the Auditors of Reality are placed alongside them and said to be the deadliest of all. They are inhuman intelligences responsible for maintaining the laws of the universe that appear as adversaries in the novels due to their hatred of the disorder of life and individuality.
** Pterry's later novels have offered more esoteric variants of this trope, [[Discworld/AHatFullOfSky the Hiver]], [[Discworld/{{Thud}} the Summoning Dark]], and [[Discworld/IShallWearMidnight the Cunning Man]], which seem more like sentient ideas and/or emotions than tentacled mishmashes. Still freakin' weird and disturbing, yet more insidious than the above examples, and more frightening in their own way -- [[YouCannotKillAnIdea ideas are, after all, indestructible]].
*** The spirit of [[Discworld/MovingPictures Holy Wood]] and the [[Discworld/SoulMusic Music]] could be considered similar entities, although their intentions or methods weren't necessarily malignant.
* The Bugs from Phillip Palmer's ''Debatable Space''. Their name isn't very evocative of what they are, but immediately after discovering them, humanity sacrificed millions of people to put up thousands of indestructible, uncrossable walls between the Bugs and the rest of the universe. Despite this, the leaders of the government live in unending, mortal fear of them. This is all entirely justified. The [[spoiler: Fire Beasts]] are also implied to be remarkably friendly, apathetic versions of this.
* Part of the Franchise/DoctorWhoExpandedUniverse declared Creator/HPLovecraft's creatures canonical and had their names originally bestowed by Rassilon. As if Cthulhu, Hastur (aka Fenric, apparently), and the Fendahl weren't enough, a number of characters (most notably the creators of the Land of Fiction and Compassion, an EU companion who became a TARDIS) have been upgraded to this kind of thing.
** The ''Literature/FactionParadox'' spin-off expanded on the Yssgaroth, things from another version of history accidentally accessed when the [[TimeLord Great Houses]] set up their version. Inimical to the existing universe, no one's sure if they were multiple creatures or just different aspects of one entity, or even if they were alive at all and not just "symptoms of a timeline that had already started ripping chunks out of its own flesh", and if they took people into their own universe... well, they've been known to string a victim's nervous system out over a planet [[FateWorseThanDeath while keeping it alive and able to sense pain.]] And it's implied that the Great Houses are secretly studying a way into their universe for military purposes. Just for additional horror, they're connected with the Great Vampires from Doctor Who, which came out of nowhere and swarmed all over the universe, each one capable of sucking a planet dry.
** Continuing on ''Faction Paradox'', we have the extradimensional realm known as [[EldritchLocation the Eleven-Day Empire]] (created by mutilating Earth's history and erasing eleven days that never existed). Moments after its creation, the Faction went there to set up shop. [[OhCrap They found the place was already occupied]]. Which didn't stop them from making a deal with the Very Nice Gentlemen and settling down like they liked. They even got several of their new friends (implied to be the living embodiments of multiversal laws) to defend their new home.
** The novel ''Sky Pirates!'' stated the early Time Wars were against creatures so utterly different that they were considered to be Eldritch Abominations. It also heavily implies that the Timelords (and especially the Doctor) are just Eldritch Abominations that have figured out the trick of [[AFormYouAreComfortableWith not instantly destroying the psyches of lesser creatures as soon as they are seen]].
*** As are their [=TARDISes=]. At one point, the disguise that prevents human companions from wanting to pull their eyes out collapses, and we're told one of the controls tries to ''bite'' him. At the very least, the Nightmare Child is this. Possibly also the Skaro Degradations, the Could've been King and Horde of Travesties as well
* Creator/JimButcher's ''[[Literature/TheDresdenFiles Dresden Files]]'' has the Outsiders, beings that exist beyond 'The Outer Gates', or the limits of known reality. They can only be summoned by mortal magic and are considered so dangerous that not only is summoning them forbidden under the Laws of Magic, but a member of the Senior Council (The Gatekeeper) has the full time duty of monitoring any possible incursions.
** In fact, just ''learning'' about how to summon Outsiders is punishable by death. [[ThingsManWasNotMeantToKnow With good reason.]]
** Also, Outsiders eat magic and destroy reality just by being present. It takes wizards hundreds of years to learn how to even hold their own against them in battle.
*** Harry Dresden increasingly seems like a living weapon against the Outsiders - while normally a single Outsider can hold down the entire White Council, Harry Dresden has beaten ''two'' distinct Outsider ''champions'', known as Walkers. Specifically, [[spoiler: He Who Walks Behind in the backstory and He Who Walks Before in Cold Days]]. It seems to have something to do with [[ViewersAreGeniuses Harry being a "Starborn" and the concept that different places and times (such as Halloween) have the ability to change fundamental magic, including granting and removing it, even from immortals]]. Perhaps Harry himself has an Outsider-pwning mantle in addition to all of his other accumulated positions.
** And there's the [[spoiler:skinwalker]] from ''Turn Coat'', which reduces Harry to a gibbering mess when he sees it with his Sight. It's a demigod and is a walking source of very, very nasty dark power.
** In ''Ghost Story'', we finally see Harry's encounter with He Who Walks Behind. It introduces itself by stating its name, which is best described as a paragraph of emotions and sensations relating to contempt and pure alien hatred for mortal life.
-->"That", a cultured British voice whispered in my ear, "is the closest your mind can come to comprehending my name."
** In ''Cold Days'', we get to see quite a bit more about Outsiders. [[spoiler:Namely, that there is a ''unimaginably massive horde'' of them trying to break into the universe at the Outer Gates. Yes, that's right, the Outer Gates are not metaphorical; they are an actual place at the farthest reaches of the Nevernever, where [[TheFairFolk the Winter Fae]] constantly fight the Outsiders' incursions and prevent them from destroying reality.]]
*** Also from ''Cold Days'', [[spoiler:Demonreach is revealed to be [[SealedEvilInACan the prison]] for hundreds of these (Abominations, not Outsiders). They're so powerful that ''six'' of the aforementioned Skinwalkers are the ''least'' dangerous.]]
* In Creator/UrsulaKLeGuin's ''Literature/{{Earthsea}}'' series, the "Nameless" are entities that the wizards refer to as the dark powers of the Earth, which are the focus of the oldest religion of the Kargad lands in ''The Tombs of Atuan''. And in a later book, the main antagonist turns out to be some crazy wizard who tried to achieve immortality -- by creating a hole which nearly sucked the entire world inside it.
* Dan Abnett's ''[[TabletopGame/{{Warhammer 40000}} Eisenhorn]]'' series contained a short story in which the inquisitor leads a mission into an alien-infested space that has been perverted. It is described as being so that there are more than 360 degrees in a circle. It disorients the humans and makes the inquisitor all the more anxious to kill the Alien.
* ''Literature/AnElegyForTheStillLiving'': The dragon.
-->Wind raced as breath or darkness formed a figure. Something large and unfathomable. As deep as the ocean and more vast. A drum as slow as time and as fast as now. Steady, like a pulse, but greater than any pulse or all. Two wings rose and fell. They rose, he saw the past. They fell, he saw his future. And he saw that the shape before him was endless and that its wings made a great circle in heaven. He saw his own death in those wings, and knew that it had already happened, and that it was still to come.
* ''Literature/FinalDays'' has the growths. Massive metal flowers that grow out of the seabed and spreads across Earth, bringing earthquakes, violent storms, and strange lights with them. Nobody knows what they are or what their purpose is, or even if they are sentient or not. The only thing that is known is that they will destroy Earth. [[spoiler:Though Stone claims they are actually benevolent.]]
* The ''Film/FinalDestination'' [[FinalDestinationExpandedUniverse spin-off book]] ''Dead Reckoning'' has the main character Jess enter what appears to be Death's realm in a dream. There she encounters what is presumably Death's true form - the vaguely humanoid Death is gigantic, composed of constantly shifting, crumbling, and regenerating bones from seemingly "every creature that ever lived", and is covered in what could be loosely described as robes made from what appears to be still living flesh that twitches and squirms. From afar, it just looks like a dark mass, and it's constantly emitting a noise that sounds like static and "thousands of birds all taking flight at the same time", while its eyes are completely blank, dark voids. Also, anything in proximity of it ages rapidly.
* The Blight, from Creator/VernorVinge's ''Literature/AFireUponTheDeep'', is a post-{{Singularity}} version. It's a five ''billion'' years-old [[TheVirus god-virus]], with no apparent goals except endless expansion. The effect of any form of contact with the Blight proper is nowhere near as merciful as simply driving you mad. Instead, you are instantly turned into the Blight's fleshy terminal, and ''then'' are eventually driven mad by becoming a [[FateWorseThanDeath helpless prisoner in your own mind]]. And it can propagate through computer networks, including interstellar ones. And it can kill the local equivalents of {{Physical God}}s - to which it appears hideously disgusting even before revealing its true nature (mere mortal minds cannot even comprehend the true nature and complexity of the Blight).
* Tais Teng's ''Glass Spears'' anthology features Nesquaam, the Elemental Darkness. He is that - pure darkness and absolute cold, but sentient and hateful. His presence will break any mind as long as it is exposed to him long enough.
* The Gaiaphage/Darkness in ''Literature/{{Gone}}''.
* Arthur Machen, who, along with Chambers and Hodgson, was a major influence on Lovecraft, is best-known today for ''Literature/TheGreatGodPan'', where an arrogant doctor attempts to open a young woman's mind to things beyond human sight, resulting in a MysticalPregnancy and HalfHumanHybrid child. Influenced Creator/HPLovecraft's "The Dunwich Horror to the point that Machen's work is [[ShoutOut mentioned by name]] in that story.
* Creator/SimonRGreen's ''Forest Kingdom'' books contain several types of Eldritch Abominations in addition to the regular [[OurDemonsAreDifferent evil demons]]. In ''Literature/BlueMoonRising'', there is a giant worm thing that devoured a mining town; in ''Down Among The Dead Men'', the BigBad is explicitly named as an evil from beyond the dawn of time; ''Blood and Honour'' has a castle slowly turning into one (a room digests its occupants at one stage, and [[BodyHorror a person is turned into a living doorway]] to a dimension full of eldritch abominations). Amongst several others.
** In the ''Literature/{{Deathstalker}}'' series by the same author, there are multiple occurrences of such abominations.
*** The massive AI planet Shub exists in more dimensions than humans can perceive and is extremely unnerving for them to look at and capable of causing insanity in some.
*** The Recreated are entities formed from the disembodied spirits of billions of sentient beings who died when the [[PersonOfMassDestruction Darkvoid Device]] destroyed their planets. Driven insane, they merged with the subconscious mind of the Darkvoid Device and used its power to manifest as civilization-destroying abominations.
*** The Terror is an entity capable of not just destroying planets, but it actually [[PlanetEater eats suns]] to refuel itself; its mere presence is enough to drive entire planets into insanity.
*** One human esper was so vile and twisted that when she was broken into four individual beings, the Uber-Espers, each manifested as an eldritch abomination.
** These things also turn up in his Literature/{{Nightside}} series, although that's got more of a comedy flavor, so its hero usually winds up either [[DidYouJustHaveTeaWithCthulhu having tea with them]] or [[DidYouJustFlipOffCthulhu flipping them off]]. Or both: it's that kind of series.
* The Namless One from the ''Literature/GriffinsDaughter Trilogy'', who exists as a malevolent mass of dark magic.
* Offal, from ''Literature/HellsChildren'' by Andrew Boland, is a baby one of these.
* The Spectres of ''Literature/HisDarkMaterials'' are semi-corporeal creatures which devour the consciousness or soul of adults (they are invisible to children and have no interest in them). They not only come from the Abyss, but they are ''a section of it''. So they are manifestations of emptiness itself running around.
** Arguably, the angels are also eldritch themselves, their real forms resembling architecture more than living things, but [[AFormYouAreComfortableWith they assume a humanoid form for our convenience]] anyway.
* The [[color:red:Minotaur]] in ''[[color:blue:House]] [[HouseOfLeaves of Leaves]]'', [[UltimateEvil maybe]].
** The [[color:blue:House]] itself. While looking at it isn't immediately maddening, all attempts to understand it or classify it fail, and it moves, reshapes, and exists in manners that should not be possible.
*** It is possible that The [[color:blue:House]] actively attempts to avoid comprehension by humans and, by doing so, drives everyone vaguely related to it ''insane.''
*** Alternately, if we take [[GainaxEnding the poem that ends the book]] into account, yet ''another'' explanation emerges: The [[color:blue:House]] is [[spoiler:the interior of [[NorseMythology Yggdrasil]], the [[WorldTree "tree"]] that holds the universe,]] and the [[color:red:Minotaur]] is, naturally, [[spoiler:the demon-serpent Nidhoggr, gnawing at its roots]]. All things considered, this may not be much better.
* Creator/AlanDeanFoster's Literature/HumanxCommonwealth series has its own UltimateEvil: a galaxy-sized region of total nothingness, where all light and matter are absorbed. Moreover, this nothingness possesses sentience and is capable of movement. Naturally, our galaxy is [[TheEndOfTheWorldAsWeKnowIt in its path]] and only TheChosenOne has any chance of stopping it.
** The same series also gives us the Vom, which, while more on the world-devouring scale than galaxy, fits several of the requisite criteria: inscrutability (it's a huge, black... mass), exponential power growth, alien thought process (it lives only to devour all life on the worlds it comes across), strange origin (possibly extragalactic), immunity to conventional weapons, and MindControl[=/=]MindRape abilities.
* The Shrike from the ''Literature/HyperionCantos''.
** [[spoiler:The Lions and Tigers and Bears]] might also count, though they are benevolent towards humans and try to help them as much as they can. The Technocore certainly thinks of them as {{Eldritch Abomination}}s.
* [[Creator/HPLovecraft Yog-Sothoth]] pulls a brief appearance in the {{Illuminatus}} Trilogy, as well as [[CthulhuMythos the Lloigors, Tsathoggua, and the Shoggoths]]; there is also, towards the end the Leviathan, a ridiculously immense, vaguely pyramid-shaped, single-celled, pre-Cambrian monstrosity with a single eye towards the top of each of its four sides as well as far too many tentacles. This being the Illuminatus! Trilogy, that's ''not'' the weirdest thing in the novels...
* Creator/StephenKing is, as we all know, particularly fond of creepy-ass creatures.
** In ''Literature/{{IT}}'', the eponymous monster is perceived as a GiantSpider by the protagonists, because this was the closest analogue that their rational minds could find for Its appearance. Attempting to fight IT can result in one's mind being flung beyond the edge of the universe, then being driven mad by the Deadlights (which IT is merely an appendage of). After the protagonists [[DidYouJustPunchOutCthulhu succeed in killing IT]], they [[LaserGuidedAmnesia magically forget about the entire incident]]; apparently, this was the only way they could have lived a normal life afterward.
*** The Turtle in the same work ''could'' qualify for this trope. Case in point, the turtle created the whole universe by being sick.
** Creator/StephenKing and Peter Straub got together to write ''Literature/TheTalisman'', a horror fantasy novel which is chock full of horrific creatures and mutants, the most disturbing amongst them is probably a mewling tentacle creature that [[AlienBlood bleeds ichor]] filled with biting white worms.
** The burial ground in ''Literature/PetSematary'' could very well be one of these outright if it isn't possessed by one. Either way, it's pretty safe to say that it's probably more than just mere haunted ground. In the book, the creature is implied to be a {{wendigo}}, and while the protagonist is [[ThroughTheEyesOfMadness a bit too crazy at the time to be sure]], it's possible that he almost ran into it.
** The short story "I Am the Doorway" is about a former astronaut who becomes the conduit for an Eldritch Abomination, manifesting in the form of golden eyes on his hands. In an unusual spin on the trope, though, said Abomination ''isn't'' malevolent -- it's terrified and disgusted by our world, which is as alien to it as it is alien to us, lashing out violently at the horrors it's forced to witness.
** In ''Literature/FromABuick8'', the titular car... isn't a car. And ''things'' come out of it...
*** Possibly his most [[WillingSuspensionOfDisbelief believably creepy]] work, since the object's origin and purpose remain a mystery [[TheUnreveal to the very end]].
** And "He Who Walks Behind the Rows" from ''Franchise/ChildrenOfTheCorn''.
*** He's implied to be just another form of Randall Flagg, who, as others have said, is more or less just Nyarlathotep with a different name.
** And Tak from ''Literature/{{Desperation}}'' and ''Literature/TheRegulators''; a sadistic, incorporeal monstrosity heavily implied to have no true form, it has no apparent motive other than causing chaos and killing everything it comes across. The effects it has on those it possesses are... [[BodyHorror disconcerting]], to say the least.
** As well as another short story, "N", told through the journals of a psychiatrist analysing a patient who believes that by keeping objects "in order" obsessive-compulsive style, he is keeping cosmic horrors at bay (which doesn't seem so strange at first, since that's a pretty common reason why obsessive-compulsives do the things they do). [[spoiler: The psychiatrist eventually, following the patient's suicide, takes over his "duty" of keeping things in order and ends up killing himself as well, due to the stress involved in keeping the cosmic horror CTHUN and the rest of its reality out of ours. It's implied that even if more people continue the duty, the barrier keeping CTHUN at bay will stop working anyway.]]
*** [[http://www.simonsays.com/specials/stephen-king-nishere/?wsref=3&num=605&v_ref=http%3a%2f%2fwww.stephenking.com%2fn%2f In this making-of featurette]], he even cites Arthur Machen's ''Literature/TheGreatGodPan'' as his main inspiration.
** In ''Franchise/TheDarkTower'' [[Literature/TheWasteLands Book Three]], Illustrated Edition, a print shown during their trip [[spoiler: aboard Blaine]] shows the part of Roland's world that has yet to even begin to recover from the wars that made it what it is. The bird-things may not reach cosmic-level, but what they indicate about the greater cosmos could snap those old neurons pretty damn fast.
** Speaking of which, [[Literature/TheStand Randall Flagg]] is implied to be an Expy for Nyarlathotep...
*** If that's the case, one could then say that the [[BigBad Crimson King]] is an Expy for Azathoth. Both are all-powerful, the source of evil, and [[spoiler: brain dead]].
** The creatures in the todash darkness from ''Franchise/TheDarkTower'' series.
** The abominations from "Literature/TheMist".
** King gives a direct ShoutOut to Lovecraft in "Crouch End", where a newlywed American couple honeymooning in London wander into the Cthulhu mythos. Shub-Niggurath, to be precise.
** There's also [[ClockRoaches the Langoliers]].
** Another fine King creation: in the short story "[[Literature/NightmaresAndDreamscapes Home Delivery]]", a thing best described as a gigantic ball of crawling worms decides to camp over the South Pole's hole in the ozone layer... and causes a worldwide ZombieApocalypse just by being there.
** [[spoiler: The Long Boy]] from ''Literature/LiseysStory'' qualifies as well. That thing... when it eats you, you don't die. You just get eternally digested, and you are ''conscious.''
** The titular mansion from ''Literature/RoseRed''.
** The evil room from ''Literature/FourteenOhEight''. A big point is made about how it's not even remotely human and never was. It's simply a madness-inducing room housing some sort of extradimensional terror that munches on its occupants.
* Proto-example: Robert W. Chambers's book ''Literature/TheKingInYellow'', which was an influence on Lovecraft himself, and he made references to it that [[OlderThanTheyThink are now better known than the original source]]. Filled with MindScrew and TakeOurWordForIt.
* The Skasloi in Greg Keyes's ''Literature/KingdomsOfThornAndBone''.
* The Ancient Enemy from Creator/DeanKoontz's ''Literature/{{Phantoms}}'' is a massive, lake-size mass of black sludge, older than the dinosaurs, and consumes other life forms as sustenance, and is able to perfectly mimic any creature it consumes. It can create small "probes" or "phantoms", imitating consumed life forms, to go forth and hunt more prey, obeying the orders of its "hive mind". In addition, the creature absorbs the mental capacity and memories of those it consumes, so its mind grows more powerful, intelligent, and self-aware over time. Besides being able to mimic real animals and people, the creature can also form phantoms based on mental images from its victims; it takes sadistic delight in creating phantoms in the shape of religious demons and monsters to terrorize its victims before killing them. The creature also apparently likes to think of itself as TheDevil. It even has human cultists.
** Another Koontz example is the extraterrestrial known as "the Giver" in ''Winter Moon''. Its method of interstellar travel is completely incomprehensible (it seems to have torn a hole in reality), YouCannotGraspTheTrueForm, and it [[BlueAndOrangeMorality does not understand the existence of death]].
* In Creator/BarbaraHambly's novel ''Literature/TheLadiesOfMandrigyn'', [[spoiler:Altiokis's power source. [[KarmicDeath It gets him in the end]].]]
* ''[[Literature/TheLaundrySeries The Atrocity Archives]]'' by Creator/CharlesStross and its sequels take place in a world where divisions that [=MI6=] and the CIA don't even know they have battle Eldritch Abominations (and their own bureaucracy) attracted to reality after Alan Turing discovered a theory that allowed the user to warp reality with computers and the [[{{Ghostapo}} Nazis attempted to summon the Great Old Ones using the souls of those slaughtered in the Holocaust]] to win UsefulNotes/WorldWarII. The books have thus far featured:
** The infovore from ''The Atrocity Archives'', [[spoiler: the only survivor of a reality where the Nazis actually managed to pull it off. Only thing is, once they unleashed "the frost giant" on the Allies, they quickly began to realize that the thing was draining the heat from... well, everything. Just sixty years later, that universe is nearing entropic heat death, and the infovore wants out...]]
** The ancient Chthonian war god in ''The Jennifer Morgue.''
** The Sleeper in the Pyramid on the Dead Plateau in ''The Fuller Memorandum'', a nameless thing kept docile through a wall of crucified, undead victims maintaining a quantum observer effect. Nyarlathotep is also name-dropped - and described as being several orders ''worse'' than the Sleeper - and quite a few of his cultists show up (they're not nice people). There's also the Eater of Souls, aka TEAPOT, aka [[spoiler: Angleton]].
* The Eddorians of the Literature/{{Lensman}} series. They came from another universe (bringing their planet along with them), they have third-stage minds and so can lethally MindRape any lesser mind, and the concept of their very existence was so disturbing that it had to be kept secret from both [[TheFederation Civilization]] and Boskone, even though the Eddorians were the founders and ultimate rulers of Boskone.
* Creator/ThomasLigotti has created a truly prodigious number of these, most fairly unconventional in presentation and overall manifestation. Perhaps the strangest is the entity central to "Ten Steps to Thin Mountain". [[spoiler:Think about the implications of the ''House of Leaves'' entry above. Apply this to a meme. Or a stray thought. ''This is what Thin Mountain is.'']]
* First Person Pronoun in ''Literature/TheLongEarth''. [[spoiler:A sentient biosphere that seeks to expand to every parallel Earth, consuming every life form living on those Earths in the process. Her very presence causes migraines in those who are in worlds near the world she is currently in.]]
* The [[BigBad Storm King]] from ''Literature/MemorySorrowAndThorn''; though ostensibly one of TheUndead, his apocalyptic dark power and [[OneWingedAngel terrible physical manifestation]] put him quite in line with the trope.
* Creator/ChinaMieville's ''Literature/PerdidoStreetStation'' has the slake-moths - monstrous, insectoid creatures that devour minds. Not literally, what the creatures feed on is the very sentience of their prey itself, leaving their victims utterly mindless shells. How terrible are these abominations? At one point, the government of New Crobuzon attempts to strike a deal with Hell to get them to intervene and stop the threat, and ''[[FoodChainOfEvil the demons are too frightened to get involved.]]''
** And then you have the Weaver, who the New Crobuzon government turns to when the demons turn them down. It's a gigantic spider that exists ''between'' dimensions and is capable of traversing them as easily as we would walk down the street. It is also ''batshit crazy'', speaking in the "flight of ideas" style most often seen in unmedicated schizophrenics and capable of doing anything to anyone, friend or foe, merely because it seems "fitting". During the brief time that the heroes are in its presence, the Weaver cuts off the ears of everyone in the room for reasons known only to itself. It also repaired the ears of some of the people, again for reasons unknown. The Weaver encountered in the book has an obsession with scissors and happily accepts them as gifts, if the term 'happy' can be applied to it. Apparently, it enjoys collecting things in general, as it is mentioned that before its obsession with scissors, it collected chess sets.
** [[Literature/IronCouncil And then]] there is the ''Torque'', described by one character as a tumour that aborted itself from the womb that produced the forces of Birth and Death. Whilst not evil per-se, it is a natural force that is almost uncontrollable which warps and mutates matter and biology into horrifying things. Merely trying to research it can turn you into an Eldritch Abomination. It was once used as a weapon; the results of the Torque Bomb were so awful that even after a generous application of {{Magitek}} versions of nuclear weapons, there's a country-sized region of the world which isn't going to be inhabitable by anything but abominations ever again. At one point, the protagonist pulls out a book of photos taken at ground zero of the inhabitants (though it may have been implied that there could be survivors) to show to a client. "That? We think it used to be a goat. Or a train."
** Oh, and in the middle of a city, there are The Ribs, the partially exposed skeleton of some enormous creature that has been dead for a very, very long time. Attempts to build over it resulted in seemingly structurally sound houses that just fell apart and tools that break long before they should, and attempts to excavate the whole skeleton tended to result in the workers suffering horrifying nightmares or disappearing suspiciously. It was decided that whatever it is is best left buried and uninvestigated.
** Then, in ''Literature/TheScar'', the second book in the series, there's the [[GiantSwimmer avanc]], something from another universe that is big enough to pull a floating city, and all that anyone knows about it is that it swims and has at least one thing that could be described as a limb.
** The creature from the short story ''Details'' is this in spades. It lives in all detailed surfaces, and if you look deeply enough into them, you can see it. The problem is that once it notices you, it will try to get you through all detailed objects, [[spoiler: including those in your memories]]. The only 100% sucessful ways of keeping it away from you are [[EyeScream cutting your eyes out]] or [[DrivenToSuicide killing yourself]], which may be [[FateWorseThanDeath better than]] [[AndIMustScream what this thing will do to you]] once it gets you.
* The Nameless from Literature/{{Merry Gentry}}. When the fey were exiled from Europe and forced to go to the States, which was the last place in the world that would accept them and allow them to keep their courts intact, they performed a spell which removed a lot of the more exotic and abominative of their powers so that they would be less likely to misbehave, horrify the humans with their other-ness and get kicked out of the last country that would have them. The horrors of their power were gathered into a single... being... that they called the Nameless and was bound by the leaders of the Seelie and Unseelie courts. It is a horror to look upon, and called indescribable by the protaganist when she encounters it.
* The Old Ones in the Monster Hunter series by Larry Correia (''Literature/MonsterHunterInternational'' and ''Monster Hunter Vendetta'' in particular) are classic Eldritch Abominations. Creator/HPLovecraft's writings are said to be the result of [[ShownTheirWork research done by talking with actual Hunters.]]
* [[Franchise/{{Nasuverse}} Nasu Kinoko's]] early work, ''[[Literature/AngelNotes Notes]]'', has "The Ultimate Ones": aliens - well, [[spoiler:''representations of planets'']] - who come to destroy the future humanity and reclaim the planet after [[GaiasVengeance Gaia dies]].
** Also, ''Fate/Zero'' has a Caster hero who's a guy with the Necronomicon summoning different Eldritch Abominations.
** ORT, the Ultimate Being of planet Mercury, is mentioned in ''VisualNovel/{{Tsukihime}}''. Its raw power is considered far greater than that of any [[OurVampiresAreDifferent Dead Apostle]]. ORT's a funny thing. Infamous in the fandom for being the Strongest Being by WordOfGod, ORT is only here because it responded to the dying message of Gaia ''before Gaia died'' and decided to wait it out here. ORT changes the laws of the universe around it, which isn't all that impressive on its own since mages can learn spells with the same effect, except when mages do it, the effect only lasts for a few seconds because reality fights back. In ORT's case, ''reality is losing.'' It also technically holds a position as a Dead Apostle vampire, but only because [[YouKillItYouBoughtIt it instantly obliterated the previous holder]] who wanted to study it (and supposedly has "vampire-like qualities"). Yeah... that's probably a lifetime membership right there.
** The Nasuverse is almost a CosmicHorrorStory if you delve into the {{backstory}}. Gaia herself is almost exactly the same type of being as ORT. The main difference is that the reality she creates happens to be one where humans evolved and can survive in. She has also not yet created her Ultimate Being, Type Earth, and it is not clear that she can, especially considering that her Blue Marble is the only planet to bear life which tries to exerts its own reality against her own. (It would be interesting to see what Type Earth's reality would be like; probably similar to what Arcueid can do on Earth.)
*** The father of all vampires, Type Moon Brunestud, ''was'' the same type of being as ORT and could reject reality and substitute his own like ORT, but doesn't exactly fit as an Eldritch Abomination since he was [[HumanoidAbomination quite humanoid and pretty]]. Also, Zelretch [[DidYouJustPunchOutCthulhu killed him.]] Apparently by dropping him into a reality where his home (''the fucking Moon'') [[ColonyDrop fell on his head]]. Some of what he ''spawned'', though, are quite terrifying. Dead Apostle Ancestors don't have to be vampiric to be counted, though, like ORT. One of them is a giant padlock, one of them is a kid with a whale, a jellyfish, a golem, and a mouse instead of limbs (well, he usually keeps them looking like actual limbs), one of them is [[GeniusLoci a forest]], and another is a living curse that looks like Count Dracula. Not all of them are vampires, ''per se''. While Nrvnqsr (Nero) Chaos isn't quite there yet, becoming one is quite obviously his main goal.
*** The thing about the Types: even if you destroy their physical bodies, ''[[FightingAShadow they still exist]]'', and they may be able to reform them. Part of the reason Type-Moon helped create the True Ancestors was because he could use them as new bodies if he was killed; he ''still'' [[DemonicPossession possesses Arcueid on occasion]]. In ''Notes'', Type-Venus is killed by a gun that attacks with the ''concept of death itself'' and still manages to manifest itself in a new but [[BroughtDownToNormal powerless form]].
** In ''LightNovel/KaraNoKyoukai'', [[spoiler:Toko Aozaki's most powerful summon is a gibbering, amorphous mix between [[Creator/HPLovecraft a Shoggoth and a Colour out of Space]], which (in the movies, at least) ''eats [[TheDragon Cornelius Alba]] alive''.]]
* In ''Literature/TheNeverendingStory'', we have the Nothing. Born from distortions in Fantastica caused by [[FisherKing The Childlike Empress']] sickness, it's not exactly a creature, but it is as eldritch as anything else. There are no adequate words to describe it. In chapter 1, a messenger tries to explain what happened to a lake that was consumed by the Nothing. It's not that the lake was drained, or that it dried out, because then, there'd be a hole or a dry lakebed there, wouldn't there? It's just... ''nothing''. Later on, Atreyu runs into some wood trolls that came into contact with it. One lost his lower body, one lost the ''left'' half of his body, and one had a giant hole eaten away. Only... they're still alive. They just can't... ''feel'' anything that was removed. When Atreyu tries to take a look at it from afar, he can't even glance at it straight on, and it pains him to see it even from the side, because his brain simply cannot comprehend the sight of nothing. It is quite simply something that should not ''exist'', and that's because it ''doesn't''.
* Another proto-example: William Hope Hodgson's ''Literature/TheNightLand'', as well as ''Literature/TheHouseOnTheBorderland'', have quite a few of these, and his descriptions of the [[EldritchLocation places]] and [[TimeAbyss times]] where such ''things'' would exist helped shape the CosmicHorrorStory.
* Peter F. Hamilton's ''Literature/TheNightsDawnTrilogy'' incorporates a positive slew of eldritch abominations: an incident involving a satanic ritual and a passing energy being creates a cross-dimensional link that allows the souls of the dead to come back and possess the living, before secreting entire planets away to their own pocket dimensions. Even worse, the trans-dimensional powers of the possessed, as well as the fact that they have absolutely no idea what they're doing, opened the door to a range of other, semi-scientific eldritch horrors, by far the worst being a [[AnotherDimension dimension]] of almost infinite entropy which, if intersected with our universe, would suck it dry like a vampire. Things get so hopeless that it a ''literal'' DeusExMachina to sort the whole mess out. Said vampire-dimension, the "Dark Continuum", has, at its center of mass, a... phenomenon called the "Melange". It's made out of the immortal souls of everyone ever trapped in this continuum, all of them [[FateWorseThanDeath writhing in eternal agony]] at [[ArtisticLicensePhysics well below zero degrees Kelvin]], most of them incapable of accumulating enough energy to break free. Those that do temporarily become vampiric bird-like Orgathe, doomed to wander the empty continuum until they eventually re-join the others in the Melange.
** The resident [[SufficientlyAdvancedAlien super-civilization]] of the ''NightsDawn'' universe (so powerful that [[spoiler: their empire consists of a ''collar of planets'' orbiting the same star]]) feel ''horrified'' and threatened at the prospect of our Universe intersecting the Dark Continuum. ''That's'' how bad it gets.
* [[BigBad Orannis]] [[OmnicidalManiac the]] [[SealedEvilInACan Destroyer]] in the Literature/OldKingdom series. He is alternately described as a sphere of light and a column of fire, and is immortal. His [[SealedEvilInACan can]] is his own frozen body, [[HalfTheManHeUsedToBe split in half,]] buried under a hill, and encased by a seal of seven different materials, including bone. He destroyed the world several times before [[OurGodsAreGreater the Seven]] finally imprisoned him. Yes, that's correct: it took seven GODS to to hold this thing. And his only real restriction is his power and movement; he can still communicate with and manipulate those around him. This is the most terrifying, [[MindScrew unnatural]] thing to come from the [[EldritchLocation terrifying, unnatural Kingdom.]]
** The other Bright Shiners may qualify as well. Granted, we only see four out of nine: [[spoiler: Orannis, who's a living [[NukeEm nuclear explosion,]] Kibeth, whose true form is a silver HellHound, Yrael, a whirling vortex of fire and lightning, and Astarael, a [[HumanoidAbomination tall woman]] with power over time, and the river of Death flowing around her.]]
* Chaos and Old Night from ''Literature/ParadiseLost'' by Creator/JohnMilton. Lucifer passes through their domain on his way to Earth, and as they obviously bear a grudge against {{God}}, they allow him safe passage. The weird thing is, we never find out exactly who or what they are, they just ''are''. And, from the look of things, clearly have a history with God!
* While the titular children in ''Literature/MissPeregrinesHomeForPeculiarChildren'' possess startling unnatural abilities themselves, they pale next to the hollowgasts, former peculiars that, through some horrifying means, have made themselves immune to the passage of time, feed on the souls of peculiars (though they will eat normals and animals if pressed), and are only visible to a few peculiars as horrible masses of eyes and tentacles. If they eat enough souls, they become wights, which can pass for humans but are only slightly less horrifying.
* The Funhouse inhabitants from ''Literature/ThePiloFamilyCircus''.
* In ''Literature/ThePowerOfFive'', the main antagonists are the Old Ones, godlike creatures clearly inspired by Lovecraft that used to rule Earth before the humans defeated them ten thousand years ago and sealed them in another universe. [[spoiler: The Nazca Lines were created as the seal, and the animal shapes drawn into the Earth were actually representative of each of the Old Ones, the familiar animals being the closest approximation the human mind could come to the Old Ones' horrifying appearance.]]
** Asmodeus, Mrs Deverill's cat, is implied to be one as well. It not only perfectly understands English, it apparently survives being shot with a shotgun, is implied to have killed Tom Burgess, and follows Matt around. It is also unaccounted for at the end of ''Raven's Gate''...
** Whilst they don't necessarily fit this trope ''per se'', the people of Lesser Malling are at least inhuman to some degree. Both [[spoiler: Sir Michael]] and Claire Deverill are noted to be incredibly fast and strong for people of their age. Mrs Deverill also seems to enjoy eating uncooked meat and looks exactly like a portrait of her "ancestor".
** The portrait itself acts like a CCTV camera and even directs Matt to go to bed on one occasion.
** The Diary of St Joseph of Cordoba has this effect on just about everything around it.
** Many of the denizens of Hong Kong in ''Necropolis''.
* The Literature/RepairmanJack novels of F. Paul Wilson had the Ally and the Otherness (who see the world as a poker chip) and The Lady (who seems to be the personification of Earth's life).
* The aliens in Arkady and Boris Strugatsky's ''Literature/RoadsidePicnic'', by proxy. These unknown aliens only stopped for a flying visit, but the detritus they leave behind, including inexplicable objects and strange phenomena ([[EverythingTryingToKillYou many of which are lethal]]) defies explanation. The best analogy given in universe is that it's as if they just stopped for a picnic on their travels, and we're just like the insects in the grass by the roadside. All that's left is their rubbish. Some of the phenomena themselves also count as this.
* The parasites that infect the protagonists in ''Literature/ScorpionShards''.
* ''Literature/SkulduggeryPleasant'' has the Faceless Ones, so named because they cannot be looked upon in their true forms without driving the observer mad and can only manifest by possessing humans, [[BodyHorror melting all features from their faces in the process]]. They are the former rulers of this reality, before their slaves, the Ancients (the first mages), managed to find a weapon capable of driving them into another reality. They are described as being so evil and sadistic that even their own shadows were afraid of them. A creature cobbled together from several monster parts including the torso of a Faceless One's host took a small army of mages to kill. When they finally appear, Valkyrie gets only a passing glance at one and is temporarily driven into a catatonic state by its impossible geometry and biology. Skulduggery explains that if they successfully return, they will wipe out half of humanity and then work the other half to death, before destroying the Earth.
** Almost worth mentioning that these all-powerful demon gods only drive the nine-part series for the first trilogy, as they soon move on to a sorceress called 'Darquesse', who's indicated to be able to take on the Faceless Ones ''and win.''
* Oddly enough, the "angels" from Creator/CSLewis's ''Literature/TheSpaceTrilogy'' show some of these traits. They exist on a profoundly different level than us, have [[AlienGeometries strange geometries]], and dealing with them can be terribly unsettling. One of the characters even notes that the fact that they're benevolent makes it worse; no matter how terrible the evil you're facing, there's always the hope that good will swoop in to save you... but what do you do when facing ''good'' turns your brain inside-out?
** The [[GeniusLoci Oyeresu]] themselves, on occasion. In explaining what they mean by "manifesting to humans", they use the analogy of the ways a stone can manifest in human perception. The glorious statue is one possible perception, but so is the sensation you have after it's fallen on your head.
** It's also worth notable that the Oyeresu, who are just as good as the Un-man is evil, have to try a few times before they figure out acceptable, vaguely humanoid manifestations; their first try is a bad acid trip -- eyes, talons, hurtling shapes in a void full of vertigo. This is, presumably, near the hit-in-the-head end of the manifestation spectrum. If it's not, that's even scarier.
** The Un-man in ''[[Literature/TheSpaceTrilogy Perelandra]]'' is a zombie-like human whose evil is so pure and different from that of any other human that it made the protagonist [[BrownNote pass out when he first saw the expression]] on its face. It is [[DemonicPossession controlled by a being]] who is invisible to us and whose true form is indescribable to humans, not fitting into any of our mental categories. It is strong enough to destroy worlds and yet subtle enough to pass through matter and manipulate human minds.
*** The Un-Man also views intelligence as just another 'tool' and will alternate between an eloquent speaker, to a childish being that enjoys killing small animals and annoying people by saying their name over and over.
** The weird angels actually make sense; see the religion/mythology entry.
* In the ''Literature/SpecialCircumstances'' series, these are one of the many ghouls, goblins, and other supernatural baddies that the title organization is supposed to handle. An Old One is Barbara Everette's introduction to the world of supernatural hostiles in ''Princess of Wands. ''
** The second part of ''[[Literature/SpecialCircumstances Queen of Wands]]'' involves one of the lesser known Old Ones and its spawned servants. Looking even at just some cellular material left behind on the ground by the passage of one of the servants is shown to induce SanitySlippage in the observer, and Special Circumstances members have trouble with keeping their wits about them when looking onto it.
* The Ro from the ''Literature/SpeciesImperative'' trilogy: beings that exist outside of normal space and whose very speech makes one feel as though they are being ripped apart.
* There's an arguable case in the Franchise/StarWarsExpandedUniverse novel ''Literature/TheCrystalStar'', with [[http://starwars.wikia.com/wiki/Waru Waru]]. "Hethrir's scientists breached the walls between dimensions and brought into existence a massive slab of meat covered with shining golden scales. Though this entity, Waru, lacked discernible sensory organs, it was highly intelligent and could communicate in a deep resonating voice." The scales were variable in size and a syrupy ichor oozed from between them. The ichor could be breathed by humans, and it was BiggerOnTheInside. It was promised a way home by the man who summoned it, and it worked with him and healed the sick, was worshipped, and ate people to replenish its healing energy. It was always lonely and ended up [[EvilIsNotAToy eating the guy who summoned it]] before collapsing in on itself.
** While in the ''Star Wars'' EU, the newly-introduced [[spoiler:Abeloth]] from the ''Literature/FateOfTheJedi'' series most definitely qualifies.
*** The mention of [[CombatTentacles tentacles]] and the associated imagery does ''not'' help...
*** Her home planet: a place in the Maw where plants eat animals which also happens to be the location of Force purgatory. Useful for something that sustains itself by ''eating force-sensitive souls''.
*** The name, incidentally, is a ShoutOut to the aboleths from DungeonsAndDragons, which are ''also'' examples of this trope.
** The 2010 Unknown Regions RPG supplement also added the [[http://starwars.wikia.com/wiki/Mnggal-Mnggal Mnggal-Mnggal]] into Star Wars' growing list of [=EAs=]. It's a formless black goo that takes over a host and devours them. It wants to consume all worlds in existence, which would be bad enough... but it delights in tormenting sentient beings even more than it does taking them over. Doesn't sound too bad by the standards of alien horrors in Star Wars... until you learn that the reason the Unknown Regions have been cut off from the rest of the galaxy since time immemorial is that the [[{{Precursors}} Celestials]] thought that the Mnggal-Mnggal was too much for ''them'' to deal with! WordOfGod says it and Waru are the same sort of being.
* ''The Three Stigmata of Palmer Eldritch'' (1965) is a novel by Philip K. Dick. The novel involves the use of mind-altering substances to create a fantasy world, similar to the Sims. Palmer Eldritch is a disturbing character, changing form, but always displaying a robotic right hand, artificial eyes, and steel teeth. Eldritch's true nature and the nature of his business is central to the plot. The theme of Eldritch's dangerous drug marketing is later revisited in Dick's ''Literature/AScannerDarkly'', to which the eponymous film is largely faithful.
* Klæl in ''TheTamuli''.
--->''We do not speak of 'it', nor do we speak of 'him'. We speak of Klæl.''
** Notably, there's also a minion of the BigBad, Azash, from TheElenium. An utterly alien creature that comes from someplace else, it's a creature so bizarre and alien that even the BigBad, an elder god (meaning a god that existed before humans existed, making him an eldritch abomination in his own right), can only control it in its larval form. In its larval form, it's a man sized humanoid... thing with an utterly alien face that mortals can be hypnotized by just by looking at the glow radiating from it, and has powerful magical abilities. Once matured into adulthood, it is utterly uncontrollable, invulnerable to any force, whether man, god, or demon, and it is stated that if ever a male and female were brought into the world at the same time and given the chance to mature, there would be no way to stop them, and they would ultimately turn the entire world into a nest. Thankfully, once matured, their first and foremost desire is to find a mate to the exclusion of all else, and it will search until it starves to death if one is unavailable.
* John Hodgman's ''Literature/ThatIsAll'' features 700 Ancient And Unspeakable Ones ([=AAOUs=] for short) that awaken from their slumber in 2012 to usher in the [[ApocalypseHow Global Superpocalypse]].
* Creator/JRRTolkien also took a few stabs at this.
** ''Literature/TheLordOfTheRings''
--->'''Gandalf:''' Far, far below the deepest delving of the Dwarves, ''the world is gnawed by nameless things''. Even Sauron knows them not. They are older than he. Now I have walked there, but I will [[TakeOurWordForIt bring no report]] to darken the light of day.
** Ungoliant from ''Literature/TheSilmarillion''.
--->Then the [[BrownNote Unlight of Ungoliant]] rose up even to the roots of the Trees, and Melkor sprang upon the mound... and their sap poured forth as it were their blood, and was spilled upon the ground. But Ungoliant sucked it up, and going then from Tree to Tree she set her black beak to their wounds, till they were drained; and the poison of Death that was in her went into their tissues and withered them, root, branch, and leaf; and they died. And still she thirsted, and going to the Wells of Varda she drank them dry; but Ungoliant belched forth black vapours as she drank, and swelled to a shape so vast and hideous that Melkor was afraid.
*** Ungoliant later attempts to eat [[PhysicalGod Melkor]]. She would have succeeded, too, if the ''Balrogs'' hadn't pulled a BigDamnHeroes...Yes, really. This is ''[[{{Satan}} Melkor]]'', Boss of Sauron, Strongest of the Valar (powers of the world/god-like beings/Angels), and only subservient to Eru (the creator/Super-God/The God) himself. Ungoliant was one big bad mama.
*** She is said to have [-"descended from the Outer Darkness, maybe, that lies in Eä beyond the walls of the World.[[note]]Outer space, for those of the scientific nature.[[/note]]"-] After breeding with other... things... [[note]]Giant Insects? Maia? Monsters created by Morgoth?[[/note]] in a valley so [[EldritchLocation corrupted by her presence]] that, 400 years later, Beren is the only mortal to have passed through it and survived, she just... wandered off. [-"Some have said that she ended long ago, when in her uttermost famine she devoured herself at last."-] But they NeverFoundTheBody.
*** Her daughter, Shelob, may count as a minor abomination.
*** Some version of the voyages of Eärendil state that he found her in some southern sea and managed to kill her. That certainly outdoes his slaying of Ancalagon the Black, greatest of the winged dragons.
** It's sort of implied that any fallen Ainu will take on eldritch characteristics. Morgoth did [[note]]"... greater than a mountain with its head above the clouds, crowned with smoke and fire, and the light of his eyes drove the lesser Ainur to madness."[[/note]] and Sauron has a fair few (such as becoming a 'shapeless, dormant evil' after the destruction of his body, causing a 'shadow of fear' to fall by beginning to manifest himself again, and his spirit towering over Mordor like a black cloud after his final downfall. Even after his downfall, he becomes, as Gandalf puts it, a 'spirit of malice that gnaws itself in the shadows'). Even Saruman may have gone this way given enough time, as there is a recurring theme of him being a kind of lesser Sauron as Sauron is a lesser Morgoth. But these guys are more like your garden variety devils than true Eldritch Abominations.
*** Saruman also turns into a towering, cloud-like form when Grima kills his physical form in the book, reaching into the West, before being blown apart. By a wind nobody can feel.
** And then there's [[http://km-515.livejournal.com/1042.html this]] disturbingly plausible theory that ''Tom Bombadil'' of all things may in reality be something very, very sinister.
* A. Lee Martinez's ''Literature/TooManyCurses'' gleefully wallows in this trope, giving us The Thing Which Devours, The Beast Which Annoys, The Black Plook, The Monster That Should Not Be, The Hideous Impaler, and The Door At The End Of The Hall.
* ''Literature/WeaversOfSaramyr'' features this with [[spoiler:Aracarat]]. The Edgefathers and Weavers count as well, being its vessels.
* Creator/AlgernonBlackwood's [[http://www.yankeeclassic.com/miskatonic/library/stacks/literature/blackwood/stories/willows.htm "The Willows"]], which was [[http://www.yankeeclassic.com/miskatonic/library/stacks/literature/lovecraft/essays/supernat/supern10.htm spoken of highly by Lovecraft himself]], features an encounter with something so alien that, even by the end, you'll have little idea what they were aside from the notion of complete otherness.
* Arguably, the "rough beast" from Creator/WilliamButlerYeats's [[http://www.potw.org/archive/potw351.html "The Second Coming,"]] although it's hard to say for sure. The vision the narrator relates doesn't sound that bad compared to some of the other things described on this page, but the effects of its coming suggest otherwise.
** The poem is about the aftermath of World War One, anticipating the further horrors of the Twentieth Century. It certainly does use Eldritch Abomination (by way of Christian apocalypse) imagery in its central metaphor, though.
* The ''Literature/InheritanceCycle'' has [[spoiler:Shruikan, Galbatorix's dragon, who became twisted through dark magic and grew to immense proportions and power, ''far'' larger and more powerful than anything has a right to be. When he flies overhead before the final battle, he blots out a large portion of the sky. And he's an OmnicidalManiac and a WoobieDestroyerOfWorlds.]]
* Creator/NeilGaiman's "Literature/AStudyInEmerald" (a crossover between the Franchise/SherlockHolmes stories and the Franchise/CthulhuMythos) reimagines every nineteenth-century world leader as an Eldritch Abomination.
* ''Literature/ASongOfIceAndFire'' folklore claims that their world is found in the eye of an impossibly large giant known as Macumber.
* Fritz Leiber's short story "A Bit of the Dark World" involves and entity that can literally turn light into darkness and make an entire hillside vanish without a trace. It (she?) is described thus:
--> "There reared out of the canyon, facing Franz, towering above him, a filiment-trailing form of shimmering velvet black...that looked like a giant hooded cobra, or a hooded madonna, or a vast centipede, or a giant cloaked figure of the cat-headed goddess Bast, or all or none of these."
* The Beast from ''Literature/TheBookOfLostThings''.
* The White Bull of Darkness from ''Literature/TheHouseOfNight''.
* Shub-Internet in ''Literature/MrBlank'' is the personification of the actual internet... and it's become a Cthulhoid deity that eats porn.
** Eldritch abominations are mentioned in passing in the [[Literature/GetBlank sequel]] as being yet another thing our retired hero doesn't want to deal with.
* In Literature/TheManWithTheTerribleEyes, there are the Void monsters stored in Iotech's basement, the beetles under the couch, the dog, and [[spoiler:the Man with the Terrible Eyes himself]].
* The Grievers from ''[[Literature/TheMazeRunner The Maze Runner Trilogy]]'' are small versions. Half mechanical, half organic killing machines. All mysteriously and frighteningly lethal. They represent the reality-bending phenomena surrounding the maze; their patterns are unknowable and their presence constant. Meeting one ''will'' result in the danger of painful death.
* The Crawler and perhaps all of Area X in Jeff Vandermeer's ''Annihilation'' is never called this, but the description certainly, disturbingly fits. An inverted tower is found with a staircase winding deeper and deeper into the earth, with [[RoomFullOfCrazy an unsettling endless sentence]] written on the wall by a ceaseless ''thing''. The nameless protagonist descends the stairs and finds it, and the description goes on for confused pages.
--> The light surged out, blinding and bleeding and thick and layered and absorbing. It so overwhelmed my ability to comprehend shapes within it that I forced myself to switch from sight, to focus at first on reports from other senses. [...] As I adjusted to the light, the Crawler kept changing at a lightning pace, as if to mock my ability to comprehend it. It was a figure within a series of refracted panes of glass. It was a series of layers in the shape of an archway. It was a great sluglike monster ringed by satellites of even odder creatures. It was a glistening star. My eyes kept glancing off it as if an optic nerve was not enough. [...] What can you do when your five sense are not enough? Because I still couldn't ''see'' it here, and that's what scared me the most. Why couldn't I ''see'' it?
** Then she finds it and things get so much worse. As a bonus, a sample tube scraped off its surface reveals that it's made of human brain cells, there is a human being inside surrounded by "indescribable things I could think of only as his jailors", and characters infected by contact with it start "changing" in at first subtle ways, like glowing and gaining SuperSenses, with the implication that they might turn into that, or animals, or moss. Oh, and when the Crawler reaches the bottom there will be a "convulsive season of barricades and blood."
* William Gibson has one in his short story ''Hinterlands'' only called ''The Fear of the Big Night'' which comes back when people brave enough to go on interstellar trips via an unexplained jumppoint arrive back to base. All of the ones who took the trip either committed suicide or died shortly after arrival. But hey, they may bring back invaluable objects from elsewhere after a few years absence, so the jumps continue.
* In ''Literature/PleaseDontTellMyParentsImASupervillain'', the team manages to stumble onto one of these completely by accident. After choosing a random middle school to attack and a random semi-rare material to steal, Penny ends up with a jade ArtifactOfDoom in her lap, and then out comes the dragon. When it's close to defeat, it morphs into this humongous tentacled mass with eyes peeking in from alternate dimensions and such. It's later explained that it wasn't a real dragon, and was just masquerading as one.

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