Ug-Qualtoth

Ug-Qualtoth is an entity, mentioned in Fallout 3 and Fallout: The Roleplaying Game.

Background
Ug-Qualtoth is an entity described by most as a "forgotten god," with its worshippers suggesting that this may not be the case. It is stated that only the "Screaming Sound of Ug-Qualtoth" can wield power of The Krivbeknih. Richard Dunwich, founder of Dunwich Borers LLC, and his sibling Constance Blackhall, were worshippers of Ug-Qualtoth and were known for an "obsession with the occult." Two of their locations, the Dunwich Building in Washington, D.C. and Dunwich Borers in the Commonwealth, were being used as a grounds to uncover a "great monolith" related to Ug-Qualtoth.

Dunwich Borers LLC was responsible for creating rock-tunneling drills, which were tested within one of their marble quarries. In the same quarry was the site of an ancient temple dedicated to dark gods, whose adherents practiced human sacrifice. Dunwich Borers LLC's abysmal record of human safety precautions, which often led to employee deaths, is stated by some to be an intentional move to "bring eldritch attention and supernatural powers" to corporate leadership as a form of modern sacrifice.

Underneath the Dunwich Building in Washington is a alter related to Ug-Qualtoth, with all of its investigators being deceased. Jaime Palabras, a Ghoul found near the alter, came to Dunwich Building in search of his father, who on an expedition, discovered a book bound in "odd black leather," stamped with strange glyphs. Initially planning to sell it to Brotherhood of Steel Scribes, Jaime's father wound up in the Dunwich Building after vowing to return the book "to its source." His body and the book was discovered by Jaime, who noted that he was "becoming like [the zombies]" and that the book was "warm against the stone."

Constance Blackhall's occult obsession extended to Point Lookout, where their family was involved in its commercialization during the early 21st century. Constance used their wealth from their brother's ventures to obtain many archaic texts and artifacts, including a book named The Krivbeknih, which shares its origins with the Ug-Qualtoth alter beneath Dunwich Building. They drew a small group of devotees and formed a sect dedicated to the book. Constance survived during and after the Great War, with local legends accrediting their long life to the book before it was stolen, leading to their death.

Constance's descendent, Obadiah Blackhall, also worships Uq-Qualtoth. He was interested in obtaining the Krivbeknih, as a means to restore power to his family from the local Swampfolk at Point Lookout who possess the book. Marcella, a missionary, traveled to Point Lookout to spread her faith. While there, Obadiah solicited her to find the book, which she investigated further, finding out its name and mentioning that it must be destroyed. During the quest The Dark Heart of Blackhall, the Lone Wanderer is tasked with destroying the book by pressing it against the Ug-Qualtoth alter underneath the Dunwich Building.

Appearances
Ug-Qualtoth is mentioned in Fallout 3 and Fallout: The Roleplaying Game.

Behind the scenes

 * In the Fallout 3 game files, there is unused bloody drawing of the Ug-Qualtoth statue from the Dunwich Building.
 * The quote "Ug-Qualtoth knows the gate. Ug-Qualtoth is the gate. Ug-Qualtoth is the key and guardian of the gate!" from the Fallout 3 Official Game Guide is a reference to the quote, "Yog-Sothoth knows the gate. Yog-Sothoth is the gate. Yog-Sothoth is the key and guardian of the gate. Past, present, future, all are one in Yog-Sothoth." from the H.P. Lovecraft book, The Dunwich Horror.