Eldritch Being

"The Old Ones were, the Old Ones are, and the Old Ones shall be. Not in the spaces we know, but ‘between’ them, They walk serene and primal, undimensioned and to us unseen."

- H. P. Lovecraft, "The Dunwich Horror".

Eldritch Abominations is a term popularized by the Cthulhu Mythos and TV Tropes; the word "eldritch" means something like "coming from a foreign realm". These beings are the strangest the universe has to offer; even for alien standards they're otherworldly. They are usually extremely powerful and typically display unexplainable and supernatural abilities.

They may manifest themselves either corporeally or noncorporeally. In some cases, their physical manifestations constitute a mere shadow of what they truly are, and they may have several avatars.

Often, these beings are neutral towards lesser life forms, but they might be extremely malevolent and pure evil (ex: Nyarlathotep, It, Great Intelligence, Mind Flayer, Eihort and Y'golonac), or in rare cases they might be friendly (ex: Mr. Nobody).

Types of Abominations

 * Adorable Abomination:
 * Angelic Abomination:


 * Animalistic Abomination:
 * Botanical Abomination:
 * Humanoid Abomination:
 * Mechanical Abomination:

Literature

 * Cthulhu Mythos:
 * Cthulhu
 * Shoggoth
 * Azathoth
 * Nyarlathotep
 * Colour Out of Space

Comic Books

 * DC:
 * Dark Giants
 * Star Conquerors
 * Marvel:
 * Dormammu
 * Shuma-Gorath
 * Many-Angled Ones
 * Ogdru Jahad (Hellboy)

Live-Action TV

 * Doctor Who:
 * Animus
 * The Great Intelligence
 * Nestene Consciousness
 * Great Vampires
 * Reapers
 * The Beast
 * Insects (Lexx)
 * Mind Flayer (Stranger Things)
 * Supernatural:
 * Angels
 * Leviathans
 * Yokoth and Glythur
 * The Darkness
 * The Shadow

Western Animation

 * Ben 10: Ultimate Alien:
 * Lucubra
 * Dagon
 * DC Animated Universe:
 * Old Ones
 * Final Space:
 * Mooncake
 * Arachnitects
 * Titans
 * Invictus
 * Werthrent
 * Bill Chipher (Gravity Falls)
 * Dark Ones (Super Robot Monkey Team Hyperforce Go!)

Video Games

 * Giygas (Mother/EarthBound)
 * Flood (Halo)
 * Lavos (Chrono Trigger)
 * Brethen Moons (Dead Space)

Quotes
"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."

- William Dyer describing Shoggoth.

"Words are a waste describing their horror."

- Nightfall describing the Titans.