|“||It was a terrible, indescribable thing vaster than any subway train—a shapeless congeries of protoplasmic bubbles, faintly self-luminous, and with myriads of temporary eyes forming and un-forming as pustules of greenish light all over the tunnel-filling front that bore down upon us, crushing the frantic penguins and slithering over the glistening floor that it and its kind had swept so evilly free of all litter.||„|
|~ A description of Shoggoth.|
The term "Lovecraftian Horrors", also known as Eldritch Abominations or Cosmic Horrors, applies to villains (and in some cases objects, places, or even events) that are or eventually transform into otherworldly entities or esoteric objects of preternatural nature beyond rationalization, too alien from "normal" flesh-and-blood beings to be described properly, and most often insanity-inducing. Alternatively, beings whose aspect is clearly stated to be an approximation of what they really are, something that humans can process while their real form is inconceivable. At the very least they must be as close as possible to such beings and a clear, stated tribute to Lovecraft.
Howard Phillips Lovecraft, better known as H.P. Lovecraft or Lovecraft for short, was a horror writer who influenced the genre greatly. Instead of traditional evildoers, he created "horrors": indescribable, indefinable, inconceivable entities, whose existence contradicts the laws of physics, whose aspect alone is beyond human logic, and as such can induce madness by their mere presence. Although malevolent by human standards, most of Lovecraft's "horrors" are amoral beings that are either insane or too alien for humans to understand. Very few of them are desirable to be around, however, and thus are similar to villains in the sense of being harmful, and generally a threat to the world at large.
The fame of Lovecraftian Horror theme also led to development of other variants of Lovecraftian Horrors such as:
Animalistic Abominations are Lovecraftian Beings that have animalistic characteristics or rather being animals with eldritch attributes. This form of Lovecraftian Horrors may portrayed as non-sapient or semi-sapient beast whom more than often Eldritch in origin. They can also started off as normal animals until something happened on them and turned them into eldritch beasts.
Humanoid Abominations are form of Eldritch Abominations that can pass on as human or at least as humanoid beings. What made these eldritch entities more tricky than standard Eldritch Abominations are their capabilities to pass on as humans, interacts, and even behaves like normal humans do to conceal their inconceivable and horrific nature. It is more than often many humans whom interacts with Humanoid Abominations not realizing what their true self are until it is too late. However, some humanoid abominations actually do started off as a typical human being, but something went wrong at some point in their lifetime that resulting them gained horrific disfigurement and powers so hideous and ugly that date to gaze or have a glimpse of their true form would render one become insane.
Mechanical Abominations are Artificial Intelligence (be it steampunk-esque robots or sentient programs) that is created by a certain civilization through either Lovecraftian-esque sorcery or simply advanced technology that continues to upgrade, evolve, and build upon itself until the extent of its power is unfathomable. Because of it, the said A.I.'s development, physical and mental sentience, and functioning capabilities evolved to the point of being unpredictable and incomprehensible to humans.
Another version of Eldritch abominations in that they are made of plants.
Lovecraftian horrors with angelic themes.
Another type of Eldritch Abominations as dragons.
Lovecrafitan horrors who are of undead nature.
Eldritch beings who are oddly cuter in appearance.
Some things that were never an abomination in the source material and turning them into eldritch abominations.
Lovecraftian versions of the mythical jolly gift-giving toy-maker Santa Claus.