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Petroleum Effect by PetroleumHead reviews
A dark alternative Mass Effect universe with a little bit of XCOM and a little bit of Cthulhu Mythos, along with some short-lived Care Bears. If humanity discovers that, in the right circumstances, petroleum can be used as a superior alternative to element zero, just how far will Earth's increasingly post-human, xenophobic, authoritarian government go to obtain oil?
Crossover - Mass Effect & Cthulhu Mythos - Rated: M - English - Sci-Fi/Horror - Chapters: 20 - Words: 74,983 - Reviews: 31 - Favs: 52 - Follows: 63 - Updated: 16h - Published: 9/16/2023
The Shadow Over Pen by YouWontEvenTalkToMe
After being forced to flee a campsite on the ruins of a ghost town and her job as the assistant manager, Miss I.M. Herschel loses important memories of her past after turning to alcohol. When she purchases a plane ticket to a mysterious island and receives a job offer from a real estate developer there, she forgets to realize that her world is about to get wild.
Crossover - Animal Crossing & Cthulhu Mythos - Rated: T - English - Horror/Hurt/Comfort - Chapters: 2 - Words: 1,586 - Updated: 9/26 - Published: 9/19 - Rover, Tom Nook, Isabelle, OC
The Shadowlands of Medway by The Witch King's Dalek Cat reviews
The Doctor has landed upon the doomed world of Medway, but he isn't alone. The Daleks, also marooned, are in pursuit & beyond into the wilderlands of the ill-fated planet waits adventures & horrors. With his greatest enemies looming close behind & the unknown before him, can the Doctor reach the Tardis before Medway succumbs to the inevitable?
Crossover - Doctor Who & Cthulhu Mythos - Rated: M - English - Sci-Fi/Horror - Chapters: 11 - Words: 30,072 - Reviews: 2 - Favs: 1 - Follows: 1 - Updated: 9/20 - Published: 9/2 - 4th Doctor, Daleks
A Young Girl's Weaponization of the Mythos by Zahariel reviews
Tanya thought that writing a paper on the potential applications of ancient magic would be her ticket to being assigned to boring, useless, SAFE research work far from the frontlines. But her crazy theory turned out to work well beyond her expectations, and now, as the head of Division Y, she has to manage the mad scientists and monsters under her command. Curse you, Being X !
Crossover - Cthulhu Mythos & Youjo Senki: Saga of Tanya the Evil - Rated: T - English - Parody/Supernatural - Chapters: 37 - Words: 286,860 - Reviews: 665 - Favs: 1,416 - Follows: 1,457 - Updated: 8/28 - Published: 12/25/2022 - Tanya, Viktoriya
The Bored Outer God II: Through the Gate by DaemonSultanah reviews
In 2081, a gate mysteriously opens in Santa Maria, a city in the Antarctic Dominion's Province of Naashoth. Out of it comes an opportunity, a casus beli, a chance for the great Antarctian war machine to move once again.
Crossover - Cthulhu Mythos & Gate - Jietai Kare no Chi nite, Kaku Tatakeri - Rated: M - English - Horror/Humor - Chapters: 9 - Words: 42,489 - Reviews: 5 - Favs: 58 - Follows: 59 - Updated: 8/22 - Published: 10/18/2021 - Pina
A Snake Called Nyarlathotep by DaemonSultanah reviews
In London, four very different people team up on a jewel heist, then try to double-cross one another for the loot- wait, wrong, uh, everything. When High-Pharaoh Nyarlathotep is summoned by a cult to do their dirty work, he finds himself thrust into a universe where Dumbledore is an evil idiot, the Weasleys are scheming, Harry Potter is female, and Hermione is a terrible person.
Crossover - Harry Potter & Cthulhu Mythos - Rated: M - English - Parody/Humor - Chapters: 8 - Words: 39,463 - Reviews: 2 - Favs: 78 - Follows: 105 - Updated: 8/22 - Published: 3/2/2022 - [Harry P., Draco M.] George W., Fred W.
My Aunt Hatty: Volume I by DaemonSultanah reviews
In which Harry Potter starts off Third Year by discovering he has a semi-insane globe-travelling dark witch for a Great Aunt. Heavily-AU
Crossover - Harry Potter & Cthulhu Mythos - Rated: M - English - Humor/Adventure - Chapters: 3 - Words: 27,894 - Reviews: 2 - Favs: 36 - Follows: 57 - Updated: 8/6 - Published: 6/28 - Harry P., OC
Mythos Effect by Omniscent1 reviews
A crossover between Mass Effect and Cthulhutech. Humanity has won the Aeon War and has since expanded and thrived. How will the galaxy fare with this new power?
Crossover - Cthulhu Mythos & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 29 - Words: 246,813 - Reviews: 2059 - Favs: 5,381 - Follows: 6,190 - Updated: 8/6 - Published: 6/5/2013 - Saren A., Shepard, OC
RWBY Noir by Wombag1786 reviews
"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its content." In 1919, the world has seen the horrors of the great war come to an end, yet forces behind the vale of sanity work and worm into the booming new world. Thankfully, humanity will not be alone in this madness. Though Madness, may prove to be a Blessing then Sanity.
Crossover - Cthulhu Mythos & RWBY - Rated: M - English - Mystery/Horror - Chapters: 72 - Words: 549,554 - Reviews: 271 - Favs: 161 - Follows: 182 - Updated: 7/22 - Published: 10/16/2019 - OC, Team RWBY, Team RNJR
Descent Into Madness by Alsas1975 reviews
Former Death Eaters are being found brutally murdered. A new friend leads to a quest with far-reaching ramifications for the magical world and beyond. A tale of intrigue, betrayal, and friendship set against the backdrop of the Triwizard Tournament. H/Hr, with a different take on Lunar Harmony. Rated M for language and graphic violence.
Crossover - Harry Potter & Cthulhu Mythos - Rated: M - English - Mystery/Horror - Chapters: 19 - Words: 120,863 - Reviews: 263 - Favs: 807 - Follows: 562 - Updated: 6/5 - Published: 4/4/2018 - [Harry P., Hermione G.] Luna L. - Complete
Universe 1-A Tales - Adventures In Harrysitting by DaemonSultanah
Adventures In Harrysitting…AKA An Introduction To My Version of the Cursed Crap-Pile – or…in which Harry Potter is an insane ex-international criminal, Fred and George are crime lords and corporate entrepreneurs richer than the Malfoys, Neville Longbottom is the future Headmaster of Hogwarts, Ron is quidditch Elvis, Dumbledore is dead Jim, and no one remembers Harry is Nyarlathotep
Crossover - Harry Potter & Cthulhu Mythos - Rated: M - English - Parody/Humor - Chapters: 1 - Words: 5,913 - Favs: 5 - Follows: 7 - Published: 5/15 - Harry P., Ron W., George W., Fred W.
Hostis Publicus - The Ballad of Rock Ridge by DaemonSultanah
Summary Inside – Just Work With Me Here…Please
Crossover - Addams Family & Cthulhu Mythos - Rated: M - English - Western/Humor - Chapters: 1 - Words: 10,739 - Favs: 1 - Follows: 1 - Published: 5/8
The Last Nightmare On Elm Street by evolution-500 reviews
A "Nightmare on Elm Street"/Cthulhu Mythos one-shot in which Freddy Krueger stumbles upon something unlike anything he had ever encountered, one with deadly and terrifying consequences.
Crossover - A Nightmare on Elm Street & Cthulhu Mythos - Rated: T - English - Horror/Tragedy - Chapters: 1 - Words: 3,204 - Reviews: 4 - Favs: 5 - Follows: 3 - Published: 4/2 - Freddy K. - Complete
Universo Lovecraft-Park by ReyNoMuerto reviews
Cthulhu había sido derrotado, Mint-Berry Crunch le había robado a Kenny su oportunidad de entender quién o qué era realmente; pero eso no significaba que fuera a rendirse tan fácilmente. Estaba decidido a seguir investigando sobre el Necronomicón , sobre los Antiguos y sobre su maldición. Seguiría la huella de los dioses hasta donde fuera que esta lo condujera, hasta el final.
Crossover - South Park & Cthulhu Mythos - Rated: M - Spanish - Adventure/Supernatural - Chapters: 34 - Words: 175,217 - Reviews: 3 - Favs: 5 - Follows: 5 - Updated: 11/25/2023 - Published: 10/1/2022 - Eric Cartman, Kenny M., Kyle B., Stan M. - Complete
Seekers of Remnant - New Version by Zeroraid reviews
He never asked for the curse of Insight, and he never asked for the accursed powers or the life that came with it. If anything he'd run as fast and as far as he could to escape the cards he'd been dealt, but a meeting with one he can't run from leads him to fulfilling a duty he'd much rather not. But when an Ogdru Jahad wants him to help it stay sleeping, who was he to deny it?
Crossover - Cthulhu Mythos & RWBY - Rated: M - English - Horror/Adventure - Chapters: 1 - Words: 3,310 - Reviews: 1 - Favs: 7 - Follows: 10 - Published: 10/26/2023 - OC
Seekers of Mobius by Zeroraid reviews
He never asked for the curse of Insight, and he never asked for the accursed powers or the life that came with it. If anything he'd run as fast and as far as he could to escape the cards he'd been dealt, but a meeting with one he can't run from leads him to fulfilling a duty he'd much rather not. But when an Ogdru Jahad wants him to help it stay sleeping, who was he to deny it?
Crossover - Sonic the Hedgehog & Cthulhu Mythos - Rated: M - English - Horror/Adventure - Chapters: 1 - Words: 3,373 - Reviews: 1 - Published: 10/26/2023 - OC
Whispers of the Deep Sea by ogodcan
A team of Greek demigods embarks on an epic quest to the strange town of Briar Moor. Guided by prophecy and mysterious dreams, they uncover a dark secret lurking beneath the town's eerie facade. As they confront eldritch horrors and put together the story of a failed quest, the demigods must harness their unique powers and make uneasy alliances to make it out alive.
Crossover - Percy Jackson and the Olympians & Cthulhu Mythos - Rated: M - English - Chapters: 2 - Words: 4,209 - Favs: 4 - Follows: 5 - Published: 10/14/2023
God of War: R'lyeh by GreenSonic420 reviews
Kratos ventures to a new land and finds out that it is being corrupted by an evil god. This story is a sequel to The Last Temptation of the Ghost of Sparta. (Warning: Blood, Fighting, and Some Swearing)
Crossover - God of War & Cthulhu Mythos - Rated: M - English - Adventure/Sci-Fi - Chapters: 1 - Words: 5,203 - Reviews: 1 - Published: 9/28/2023 - Kratos - Complete
Elder Times by ElliotJA reviews
The Hulk finds himself somehow deposited twenty thousand years in the past, in the realm of Valusia, which is currently under attack from a ferocious dragon. Featuring Robert E. Howard's King Kull.
Crossover - Incredible Hulk & Cthulhu Mythos - Rated: K - English - Chapters: 2 - Words: 1,997 - Reviews: 1 - Favs: 1 - Updated: 9/26/2023 - Published: 9/15/2023 - B. Banner, Joe Fixit/Gray Hulk - Complete
Beauty and the Elditch Horror by The Abe Simp reviews
A parody of beauty and the beast with hp lovecraft and his wife sonia
Crossover - Cthulhu Mythos & Beauty and the Beast - Rated: T - English - Romance/Parody - Chapters: 1 - Words: 85 - Reviews: 2 - Published: 9/1/2023 - Belle, Beast/Prince
The midnight society by The Abe Simp reviews
Join hp lovecraft, Edgar allan poe, sonia greene Stephen king and Mary shelley in the midnight society
Crossover - Cthulhu Mythos & Edgar Allan Poe - Rated: T - English - Humor/Friendship - Chapters: 1 - Words: 160 - Reviews: 1 - Published: 8/28/2023
In-Universe Papers: A Multifandom Compendium by DarkEmpress239
Welcome to my chaotic compendium! This is exactly what the title suggests it is. If you haven’t deduced that, this is a collection of essays, extracts, snippets, letters, you name it, from various fics I have – both published and not, across various fandoms. Many of these don’t appear in the fics themselves, or at least not in full. This is unbetaed, rated M for safety.
Crossover - Harry Potter & Cthulhu Mythos - Rated: M - English - Chapters: 2 - Words: 1,838 - Favs: 1 - Follows: 1 - Published: 7/27/2023
The Secret of Xicalpan by Thranduil Oropherion Redux reviews
Indiana Jones goes on a search and finds his own worst nightmare
Crossover - Indiana Jones & Cthulhu Mythos - Rated: T - English - Adventure/Horror - Chapters: 3 - Words: 17,786 - Reviews: 6 - Favs: 3 - Follows: 4 - Updated: 7/22/2023 - Published: 7/19/2023 - Indiana Jones, OC
Legacy of the Arcanist by LuckyMe8ball reviews
Evan Goodwin who was fighting Eldritch beings for his entire life, got himself into his final encounter with The King in Yellow. After the battle he was transported into weird world with more advanced techonology. Evan uses this oportunity and decides to go on a retirement to find happines in normal life. Little did he know that it was the beginning of a another great journey.
Crossover - Cthulhu Mythos & High School DxD/ハイスクールD×D - Rated: M - English - Adventure/Romance - Chapters: 2 - Words: 10,054 - Reviews: 4 - Favs: 43 - Follows: 65 - Updated: 4/21/2023 - Published: 2/14/2023 - H. Issei, OC
Nightmare by LordRockhim
Dreams need a meaning, guess the distance of hell? Thou shall not awakened The Great Old Ones Ayanokouji dream something, before the day of his salvation. What in the hell is happening?
Crossover - Classroom of the Elite/ようこそ実力至上主義の教室へ & Cthulhu Mythos - Rated: K - English - Romance/Horror - Chapters: 1 - Words: 2,936 - Favs: 6 - Follows: 2 - Published: 4/2/2023
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