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Howard Phillips Lovecraft, or H. P. Lovecraft (August 20, 1890 – March 15, 1937) was an American horror writer who influenced the genre greatly. Instead of traditional villains, he created "horrors": indescribable, indefinable and inconceivable beings whose existence contradicts the laws of physics and whose aspect alone is beyond human logic; as such, they can induce madness by their mere presence.

Although malevolent by human standards, most of Lovecraft's "horrors" are 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 term "Lovecraftian Horrors", also known as Eldritch Abominations or Cosmic Horrors applies to otherworldly entities beyond rationalization, too alien from "normal" flesh-and-blood beings to be described properly, and most often madness-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

They can have been mortals who were transformed into atrocious, unfathomable beings way beyond the usual demonic "True Form" of a Final Boss, willingly or not. They might be slightly lower scale, closer to what can be concieved in appearance by still unfathomable. But they always be way beyond normal existence and understanding. At the very least, they must be as close as possible to such beings.

No matter how nightmarish they are, villains who are merely gigantic and hideous, an amalgamation of creatures and/or are cataclysmic aliens (e.g. GOLB) do NOT fit in this category. However, some Aliens can still be Lovecraftian horrors (e.g. Galactus and Evolt). Cosmic Entities and Energy Beings can (and frequently do) overlap with Lovecraftian Horrors, but are distinct types of villains. The difference with them is their true form can not be known, unlike the two others.