Eldritch abomination

Eldritch abominations, also referred to as “eldritch beings”, (PROSE: Pessimist and the Dromedaries) “eldritch gods”, “eldritch demons”, (PROSE: The Grand Multiverse Hotel) “eldritch monsters”or “Lovecraftian nightmare gods”, (PROSE: Our Strange and Wonderful House: Remnants and Reminders) were a broad category referring to vast, powerful beings whose nature and abilities seemed outside of their observers' understanding of reality. In some cases, “eldritch abominations” were termed such by observers who came from very different universes from themselves, while being relatively normal by the standard of their own realities.

History

In the Void Between Worlds

The Embodiments

Lord Thymon, one of the Embodiments, was sometimes referred to as an “eldritch abomination”, (PROSE: Acquaintanceship-982 and the Missing Mail Mystery, The Grand Multiverse Hotel) albeit an “odd” one. (PROSE: Misadventures in the Interdimensional Black Market) On other occasions he was variously described as an “eldritch being” (PROSE: Pessimist and the Dromedaries, Multiversal Mischief) or an “eldritch monster”. (PROSE: The Winter Quests) One version of Jenny Everywhere described the Embodiments as “the eldritch gods of the Void”. (PROSE: The Grand Multiverse Hotel)

Others

Many “eldritch abominations” were banished into the Void Between Worlds over the millennia. (PROSE: The Interdimensional Tavern, The Grand Multiverse Hotel) The Interdimensional Tavern was often attacked by some entities, but they could usually be placated using free drinks. (PROSE: The Interdimensional Tavern)

One eldritch abomination, whose physical form possessed a great number of teeth, nearly swallowed Tracker-764's Void Ship and its bite damaged it, causing it to crash-land in the Interdimensional Black Market. (PROSE: Misadventures in the Interdimensional Black Market)

Alistair Neezley had to navigate around an “eldritch monster” when returning to the Tavern from the Interdimensional Soda Jerkery with CS-NA aboard his Void Ship. (PROSE: The Winter Quests)

Interdimensional incursions

Attacking the Strange and Wonderful House

“Lovecraftian nightmare gods” were among the forces from other realities connected to the Strange and Wonderful House who threatened to overwhelm it, alongside more mundane threats like zombies and “steampunk pirates”, against which the Observatory sought to defend the House and its inhabitants. Over the years, these various dangers decimated the residents of the House, until one of its original creators believed he was the last. (PROSE: Our Strange and Wonderful House: Remnants and Reminders)

Junter and Iblis's universe

In one universe, after Junter accidentally turned the toilet bowl of his and Ibdis's bathroom into an interdimensional portal, (COMIC: Eldritch A-bowl-mination) an eldritch being referred to as “the unspeakable horror” came through and took over the bathroom, locking it from the inside. After hearing it laughing, (COMIC: Evil Bathroom) Junter and Ibdis entered and got a direct look at the entity, appearing as a mess of tentacles, pincers, and eyes on stalks. It attacked one of the Junterlings. (COMIC: Eldritch A-bowl-mination) At first, Junter tried to deal with the unspeakable horror by decorating it so as to try and make it into an inconspicuous element of the bathroom decor, but Ibdis was unimpressed, demanding a more permanent solution. (COMIC: Cthulhu Toilet) In response, Junter tried to dissolve the creature by pouring acidic chemicals into the toilet bowl, but they instead altered the horror's biology, causing it to abruptly gain human-like intelligence and the power of speech. (COMIC: Junter's Guide to Plumbing) Junter attempted to defeat it, but was unsuccessful, although Junter's efforts did cause the creature to spit out a letter of invitation to Kokotomo Island. In the end, Junter and Ibdis conned Mr Norman into buying the apartment from them, without having gotten rid of the horror. (COMIC: A Letter From Beyond)

Euclidean Plane

From the perspective of the Geometrons, three-dimensional, non-geometrically-regular beings like the Crew of the Copper-Colored Cupids appeared as “dreadful extradimensional eldritch abominations”. (PROSE: Multiversal Mischief)

Other

The Drink-Mixer of the Interdimensional Tavern, who constantly changed appearance and identity on a whim in such a way that everyone around them believed they had always been what they currently were, was once described as “eldritch”. (PROSE: The Winter Quests)