Eldritch Abomination/Literature

""That," a cultured British voice whispered in my ear, "is the closest your mind can come to comprehending my name.""
 * The Great Old Ones (most famously Cthulhu) in the writings of H.P. Lovecraft (and the Mythos they spawned), of course, are the Trope Codifier. 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 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.
 * 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 thank to Unreliable Narrator.
 * 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 "damnably human" in their appearance.
 * Towards the end, Herbert West had a vat of reanimated reptilian flesh which he used to animate body parts, producing minor Eldritch Abominations.
 * Lovecraft pretty much codified the language used to describe these things: "eldritch", "gibbering", "squamous ", and "rugose " 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.
 * The Shrike from the Hyperion Cantos.
 * 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 Abominations.
 * Oh my!
 * Offal, from Hells Children by Andrew Boland, is a baby one of these.
 * Proto-example: Robert W. Chambers' book The King in Yellow, which was an influence on Lovecraft himself, and he made references to it that are now better known than the original source. Filled with Mind Screw and Take Our Word for It.
 * Another proto-example: William Hope Hodgson's The Night Land, as well as The House on the Borderland, have quite a few of these, and his descriptions of the places and times where such things would exist helped shape the Cosmic Horror Story.
 * Arthur Machen, who, along with Chambers and Hodgson, was a major influence on Lovecraft, is best-known today for The Great God Pan, where a group of intellectuals manage to create a Half-Human Hybrid by impregnating a woman with the seed of the eponymous Greek god. Unfortunately for them, the cosmos is quite different from what they believe, and "Pan" is also the Greek word for "all"...Making this an obvious influence over Lovecraft's The Dunwich Horror.
 * And just in case the reader didn't notice the influence, the story is mentioned by name in that story. Elsewhere, the Shout Outs are more subtle.
 * Algernon Blackwood's "The Willows", which was 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.
 * Jim Butcher's The Dresden Files has the Outsiders, beings that exist beyond 'The Outer Gates', or basically 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. 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.
 * And there's the from Turn Coat, which reduces Harry to a gibbering mess when he sees it with his Sight. It's pretty much a demigod and is a walking source of very, very nasty dark power.
 * In Ghost Story, we 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.

"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 bring no report to darken the light of day."
 * In The City and the Stars, Arthur C. Clarke 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.
 * Alan Dean Foster's Humanx Commonwealth series has its own Ultimate Evil: 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 in its path and only The Chosen One 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 Mind Control/Mind Rape abilities.
 * Peter F. Hamilton's The Nights Dawn Trilogy 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 dimension of almost infinite entropy which, if intersected with our universe, would suck it dry like a vampire. Things get so hopeless that it pretty much takes a literal Deus Ex Machina to sort the whole mess out.
 * To expand, 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 writhing in eternal agony at 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 super-civilization of the Nights Dawn universe (so powerful that ) feel horrified and threatened at the prospect of our Universe intersecting the Dark Continuum. That's how bad it gets.
 * Stephen King is, as we all know, particularly fond of creepy-ass creatures.
 * In IT, the eponymous monster is perceived as a Giant Spider 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 succeed in killing IT, they magically forget about the entire incident; apparently, this was the only way they could have lived a normal life afterward.
 * Stephen King and Peter Straub got together to write The Talisman, 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 bleeds ichor filled with biting white worms.
 * The burial ground in Pet Sematary 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.
 * 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 From a Buick 8, the titular car...isn't a car. And things come out of it...
 * Possibly his most believably creepy work, since the object's origin and purpose remain a mystery to the very end.
 * And of course "He Who Walks Behind The Rows" from Children of the Corn.
 * And Tak from Desperation and The Regulators; 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...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).
 * In this making-of featurette, he even cites Arthur Machen's The Great God Pan as his main inspiration.
 * In The Dark Tower Book Three, Illustrated Edition, a print shown during their trip  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, Randall Flagg is implied to be an Expy for Nyarlathotep...
 * If that's the case, one could then say that the Crimson King is an Expy for Azathoth. Both are all-powerful, the source of evil, and.
 * The creatures in the todash darkness from The Dark Tower series.
 * The abominations from The Mist.
 * King gives a direct Shout-Out 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 the Langoliers.
 * Another fine King creation: in the short story "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 Zombie Apocalypse just by being there.
 * from Liseys Story 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 Rose Red.
 * The works of Clive Barker frequently include Eldritch Abominations.
 * The Great and Secret Show references a hidden world whose very proximity to ours causes millions of lovers to commit suicide. It is also a world of 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.
 * Nasu Kinoko's early work, Notes, has "The Ultimate Ones": aliens - well, - who come to destroy the future humanity and reclaim the planet after Gaia dies.
 * Also, Fate/Zero has a Caster hero who's basically a guy with the Necronomicon summoning different Eldritch Abominations.
 * ORT, the Ultimate Being of planet Mercury, is mentioned in Tsukihime. Its raw power is considered far greater than that of any Dead Apostle.
 * ORT's a funny thing. Infamous in the fandom for being the Strongest Being by Word of God, 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 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 Cosmic Horror Story 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 quite humanoid and pretty. Also, Zelretch killed him. Apparently by dropping him into a reality where his home (the fucking Moon) 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, mind you), one of them is 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, 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 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 powerless form.
 * In Karano Kyoukai,
 * Oddly enough, the "angels" from CS Lewis' The Space Trilogy show some of these traits. They exist on a profoundly different level than us, have 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 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 Perelandra is a zombie-like human whose evil is so pure and different from that of any other human that it made the protagonist pass out when he first saw the expression on its face. It is controlled by a being who is invisible to us and whose true form is literally 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.
 * Speaking of CS Lewis, The Chronicles of Narnia has Tash, the chief Calormene god. He's the only Satan figure in the series without origin or at least hints of what he is. Plants die in his presence, and just looking at him can turn talking, intelligent animals into normal, mindless ones.
 * In Terry Pratchett's Discworld novels (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 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."
 * It should be added that the creatures from 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.
 * It should also be added that, for some reason, on Discworld, eldritch has the additional meaning of "oblong".
 * 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 Pyramids: he mentions Yob Sodoth and Tshup Aklathep, Infernal Star Toad with A Million Young. Discworld Noir introduced Nylonathotep and makes reference to other dark gods, including Drunken Cthubopalulu.
 * There's also Dagon (cf. the Cthulhu Mythos), 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. (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 Moving Pictures, 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 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 Things have not appeared for a long time due to the themes of the Series moving on. However, in Thief of Time, we see statues of them in the History Monks' gardens -- and the Auditors of Reality are said to be the deadliest of all, indicating that despite their unassuming appearance, they are of a similar nature to the Things.
 * They're worse. The Things are mindless and have no feeling about humanity; our death would mean to them the death of a single organism of the simplest creature eking out a life in the bottom of the deepest trench of the ocean. The Auditors despise, loathe, and want the nonexistence of every member of the simplest creature eking out a life in the bottom of the deepest trench of the ocean just for living. Now think about how much they must hate humanity!
 * The Eldritch Abomination in Reaper Man 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.
 * Pratchett also won't let us forget that "eldritch" and "elven" have the same linguistic root.
 * Pterry's newer novels have offered more esoteric variants of this trope, the Hiver and the Summoning Dark, which seem more like sentient ideas than tentacled mishmashes. Still freakin' weird and disturbing, yet more insidious than the above examples, and more frightening in their own way--ideas are, after all, indestructible.
 * The Atrocity Archives by Charles Stross 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 Nazis attempted to summon the Great Old Ones using the souls of those slaughtered in the Holocaust to win World War II.
 * JRR Tolkien also took a few stabs at this.
 * The Lord of the Rings

"Then the 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."
 * The Watcher at the gates of Moria may be one of those things that managed to crawl its way up to the surface, or it may be one of Morgoth's creations, but either way, it is a borderline abomination.
 * Ungoliant from The Silmarillion.

"...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."
 * Ungoliant's daughter, Shelob, as well.
 * Ungoliant later attempts to eat Melkor. She would have succeeded, too, if the Balrogs hadn't pulled a Big Damn Heroes...Yes, really. Please note, we are talking about 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 Ea beyond the walls of the World. " After breeding with other...things... in a valley so 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 Never Found the Body.
 * Hell, Morgoth HIMSELF gets this:

"We do not speak of 'it', nor do we speak of 'him'. We speak of Klæl."
 * It's sort of implied that any fallen Ainu will take on eldritch characteristics. Morgoth did, as seen above, 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.
 * Dan Abnett's Eisenhorn series contained a short story in which the inquisitor leads a mission into an alien-infested space that has been perverted. Like, literally, space 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.
 * The Minotaur in House of Leaves, maybe.
 * The 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 House actively attempts to avoid comprehension by humans and, by doing so, drives everyone vaguely related to it insane.
 * Alternately, if we take the poem that ends the book into account, yet another explanation emerges: The House is and the Minotaur is, naturally, . All things considered, this may not be much better.
 * The Blight, from Vernor Vinge's A Fire Upon the Deep, is a post-Singularity version. It's a five billion years-old 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 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 Gods - 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, of course).
 * The Ancient Enemy from Dean Koontz's 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 The Devil. 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), You Cannot Grasp the True Form, and it literally does not understand the existence of death.
 * Inverted in the Blind God of The Acts of Caine. It is as impersonal, awful, powerful, and horrifying as anything from the 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.
 * Skulduggery Pleasant 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, 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.
 * In The Power of Five, 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.
 * Part of the Doctor Who Expanded Universe declared H.P. Lovecraft'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 Faction Paradox spin-off expanded on the Yssgaroth, things from another version of history accidentally accessed when the Great Houses set up their version. Totally 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 an entire planet 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 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. 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. And, of course, 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 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.
 * There's an arguable case in the Star Wars Expanded Universe novel The Crystal Star, with 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 Bigger on the Inside. 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 eating the guy who summoned it before collapsing in on itself.
 * While in the Star Wars EU, the newly-introduced from the Fate of the Jedi series most definitely qualifies.
 * The mention of 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 Shout-Out to the aboleths from Dungeons and Dragons, which are also examples of this trope.
 * The 2010 Unknown Regions RPG supplement also added the 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 Celestials thought that the Mnggal-Mnggal was too much for them to deal with!
 * In Barbara Hambly's Sun Wolf And Starhawk novel The Ladies of Mandrigyn...
 * The passageway between the worlds in 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 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.
 * The never-seen-and only very obliquely described-Todal in James Thurber's The 13 Clocks.
 * China Mieville's Perdido Street Station 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 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.
 * 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 totally 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.
 * To elaborate on the 'horrendous mutations' part, 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 The Scar, the second book in the series, there's the avanc, something from another universe that is big enough to pull an entire 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, . The only 100% sucessful ways of keeping it away from you are cutting your eyes out or killing yourself, which may be better than what this thing will do to you once it gets you.
 * Simon R. Green's Forest Kingdom books contain several types of Eldritch Abominations in addition to the regular evil demons. In Blue Moon Rising, there is a giant worm thing that devoured an entire mining town; in Down Among The Dead Men, the Big Bad is explicitly named as an evil from beyond the dawn of time; Blood and Honour has an entire castle slowly turning into one (an entire room digests its occupants at one stage, and a person is turned into a living doorway to a dimension full of eldritch abominations). Amongst several others.
 * In the 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 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 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 Nightside series, although that's got more of a comedy flavor, so its hero usually winds up either having tea with them or flipping them off. Or both: it's that kind of series.
 * In Ursula K. Le Guin's 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.
 * The Final Destination 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.
 * Arguably, the "rough beast" from William Butler Yeats' "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.
 * In the Bionicle series by Greg Farshtey, there is a character called Tren Krom who was so horrifying it would literally drive you insane to look at it. It is a crimson blob with hooked tentacles.
 * Rorschach from Peter Watts' book Blindsight is an intelligent, city-sized, incredibly scary vessel. Its "inhabitants", the scramblers, are one of the best examples of Starfish Aliens in fiction.
 * 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  are also implied to be remarkably friendly, apathetic versions of this.
 * The Repairman Jack 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 Vord Queen from the Codex Alera is an example of a Humanoid Abomination, but as far as the characters are concerned, she's the full trope, being immensely powerful, completely alien and amoral, and a threat to all else that lives in the world. Then she gets it into her head that she wants to be human - and that just makes her even creepier.
 * Ruin from Mistborn may count - while actually a natural part of the world, he exists on a level far beyond mortal comprehension and seeks to destroy the world not out of malice, but because destroying worlds is just what he does. He does take a human form a couple of times to talk to characters, but it's made plain that this is just a mask.
 * Tais Teng's Glass Spears anthology features Nesquaam, the Elemental Darkness. He is literally 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.
 * In The Neverending Story, we have the Nothing. Born from distortions in Fantastica caused by The Childlike Empress' sickness, it's not exactly a creature, but it is as eldritch as anything else. There are quite literally no adequate words to describe it. In chapter one, 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.
 * A. Lee Martinez's Too Many Curses 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.
 * The Ro from the Species Imperative trilogy: beings that exist outside of normal space and whose very speech makes one feel as though they are being ripped apart.
 * The Spectres of His Dark Materials 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 basically, 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 they assume a humanoid form for our convenience anyway.
 * Robert E. Howard's Conan the Barbarian ran into some (of course, Howard was a friend and correspondent of Lovecraft...). As in "The Pool of the Black One" where he prudently made the right choice in Run or Die.
 * "The Tower of the Elephant", another Conan story, gives us Yag-kosha and manages the impressive feat of turning one of these into The Woobie, with the utter hell that this creature was put through for centuries at the hands of a particularly sadistic Evil Sorcerer, who he calls a "devil in human form" with very good reason.
 * In Black Colossus, it has a truly horrific crush on the princess
 * Thomas Ligotti 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".
 * The Gaiaphage/Darkness in Gone.
 * Terry Brooks' various works are full of them, thus;
 * The Mist Wraith, a swamp-dwelling tentacle monster.
 * The creature encountered in the Wolfsktaag in The Sword of Shannara, 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
 * The parasites that infect the protagonists in Scorpion Shards.
 * The Storm King from Memory, Sorrow, and Thorn; though ostensibly one of The Undead, his apocalyptic dark power and terrible physical manifestation put him quite in line with the trope.
 * The Eidolons from Bitter Seeds are essentially sentient (and malevolent) chunks of the universal substrate.
 * Mother from Argo is essentially a robotic version of this.
 * The "Cold Thing" from 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 . To further the creep factor, it only communicates with, and on its last encounter with Earth millennia ago, it left
 * Klæl in The Tamuli.
 * Klæl in The Tamuli.

"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."
 * Notably, there's also a minion of the Big Bad, Azash, from The Elenium. An utterly alien creature that comes from someplace else, it's a creature so bizarre and alien that even the Big Bad, 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 literally starves to death if one is unavailable.
 * While the titular children in Miss Peregrines Homefor Peculiar Children 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 The Pilo Family Circus.
 * Chaos and Old Night from Paradise Lost by John Milton. 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!
 * An Elegy for the Still-living: The dragon.


 * The Skasloi in Greg Keyes' Kingdoms of Thorn and Bone.
 * Orannis the Destroyer in the Old Kingdom series. He is alternately described as a sphere of light and a column of fire, and is totally immortal. His can is his own frozen body, 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 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, unnatural thing to come from the terrifying, unnatural Kingdom.
 * Yog-Sothoth pulls a brief appearance in the Illuminatus Trilogy, as well as 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. Of course, this being the Illuminatus! Trilogy, that's not the weirdest thing in the novels...
 * Final Days 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.
 * John Hodgman's That Is All features a whole host of Ancient And Unspeakable Ones (AAOUs for short) that awaken from their slumber in 2012 to usher in the Global Superpocalypse.
 * Kim Newman's Dark Future 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.
 * The Eddorians of the Lensman series. They came from another universe (bringing their planet along with them), they have third-stage minds and so can lethally Mind Rape any lesser mind, and the concept of their very existence was so disturbing that it had to be kept secret from both Civilization and Boskone, even though the Eddorians were the founders and ultimate rulers of Boskone.
 * The Old Ones in the Monster Hunter series by Larry Correia (Monster Hunter International, Monster Hunter Vendetta) are classic Eldritch Abominations.