Adventure Conversions

Below are a collection of adventures made for a wide range of systems that could easily be converted for use with Liminal Horror. While some already include finished conversions, others are adventures with good bones that could be adapted. There is no right or wrong way to create a conversion guide, and in the end, the provided general and system specific advice can help Facilitators run things on the fly.

Conversion Guide

The Conversion Guide provides general advice on adapting adventures to Liminal Horror (from a wide range of genres and settings). It also includes system specific conversion notes that help give you a mechanics guide. Remember that these are just general notes (as opposed to steadfast edicts) and can be adjusted in order to prioritize interesting play and situations.

System Specific Conversion Notes

Finished conversions

These can be used as an exemplar:

  • Fever Swamp by Luke Gearing. Welcome to Fever Swamp, a fetid, forsaken place that no one in their right mind would enter. System: OD&D and Modern D&D Retro-Clones. (LH Conversion)
  • Let Us In by Luka Rejec. A Neo-70s modern slasher horror. In search for an inheritance, four heroes arrive to check up on rich relatives during a “harvest” festival. System: Agnostic. (LH Conversion)

Yochai Gal and the Cairn community have some fantastic examples of conversion guides in practice over at https://cairnrpg.com/adventures/conversions/ The system they use for presenting conversions is quite clear and streamlined.

Adventures to Convert

Below is a list of modules and adventures that the team thinks would work great in Liminal Horror. If you feel inspired to create and would like to help out, pick an adventure or module, write the conversion in whatever format you feel like (pdf, text file, markdown) and send it our way via Discord, bsky or post it on itch (and send me the link).

Adventure List

Adventures with Details

Mouth Brood by Amanda Lee Franck.

  • Blurb:“an odd biosphere stuck in the icy mountains of the Kaskawulsh Glacier (Canada), where the characters must venture to collect specimens of unknown origins. Touch nothing and you’re probably safe; start fiddling around and… die.”
  • System: Agnostic

Demon Driven to the Maw by Brad Kerr.

  • Blurb: “SOMETHING IS WEIRD ABOUT THIS PARTY IN 16TH CENTURY SCOTLAND. A famous thief stole a magical jewel and hid inside a castle where a party is taking place. Enter the party, find the jewel, escape with your life.”
  • System: Cairn (Mark of the Odd)

The Isle by Luke Gearing.

  • Blurb: Explore the “isle itself, the monks that inhabit it and protect its secret, and the large, open-ended” A body horror dungeon that lay beneath the waves.
  • System: The Vanilla Game (or “another fantastic or historical roleplaying game of your choosing”)

Haystack, Oregon

  • Blurb: ““Upon the Pacific coast rests Haystack, a crumbling town of 687. Boats rust in the harbour, and trash accumulates in the streets. De-industrialisation and a failing fishing economy leaves most of the population retired or unemployed. The sea does not weep for them.”
  • System: Delta Green

Sag River Extreme Cold Research Facility, Alaska by Luke Gearing

  • Blurb: A remote research station gone dark, an anomaly has awoken.
  • System: Delta Green

Mission Excalibur by Seann McAnally

  • Blurb: “A commando raid on a Nazi-occupied castle to retrieve Excalibur! In an alternate Europe gone hellishly wrong”
  • System: Agnostic

Bad Kansas City: Haunt of the Pendergast by Seann McAnally

  • Blurb: “A dense urban fantasy hex-crawl through a macabre version of 1930s Kansas City”
  • System: Agnostic

MANDELBROT SET by Claymore

  • Blurb: “a scientific disaster: when a military experiment goes wrong, a sizable area of rural Nevada is turned into a shifting amalgamation of parallel universes dubbed the Fractal Zone.”
  • System: FIST

Witchburner by Luka Rejec

  • Blurb: “an intimate, tragic adventure of witch hunting in a town huddled between rivers and mountains and forests one wet and cold October.”
  • System: Agnostic

Blackout in Crater Valley by ZOG

  • Blurb: “A VHS-era Slasher RPG for DCC RPG! Can your band of 1980’s misfits survive the horrors of Crater Valley?”
  • System: DCC Funnel

Halls of the Blood King by Diogo Nogueira

  • Blurb: “With the rising of the Blood Moon, the accursed abode of the Blood King returns to this world. The lord of all vampires comes to claim the blood that is owed to him. His halls contain treasures and secrets that would make any ambitious adventurer abandon reason and caution to seek them out. Will you risk your soul for gold and glory in the Halls of the Blood King?”
  • System: OSE (B/X Descendents)

The Dare by Kevin Ross, Bret Kramer

  • Blurb: “Halloween night. A haunted house. Will you live to see the morning?”
  • System: Call of Cthulhu

Picket Line Tango by Emily Weiss

  • Blurb: “The people of mining colony Norton Outpost are addicted to murder. Kith slaughter kin over petty conflicts and bad habits. A union strike raises tensions to a boiling point. The true killer stalks unseen among protest signs and workers on the edge of chaos”
  • System: Mothership

Haunting of Ypsilon 14 by D G Chapman

  • Blurb: Miners are disappearing without a trace, can you survive long enough to stop the horror or will you fall to a terror that lurks unseen?
  • System: Mothership

The Highway of Blood by Alex Guillotte, Ian Christiansen

  • Blurb: “The Highway of Blood is a scenario for Call of Cthulhu 7th Edition. It is set in 1975 and pays homage to the grindhouse movies of the time. For that reason, it is extremely deadly and gritty and is intended for MATURE AUDIENCES ONLY.”
  • System: Call of Cthulhu

Vampire Cruise by Amanda Lee Franck

  • Blurb: “Vampire Cruise is a 40 page ttrpg adventure zine, ready to play with any rules-light osr style system. It includes maps, lots of vampires, a mummy cult, and room service.”
  • System: Agnostic

Sleeping Place of the Feathered Swine by Logan Knight

  • Blurb: “A little 28 page cave-borne adventure about harvesting valuable cysts from a sleeping creature, trying not to be killed by the horribly mutated infectious things that already tried that, and helping a wizard who recently lost all his friends and just wants to get his spellbook back.”
  • System: Agnostic

Chicago Chronicles Volume 1 by World of Darkness

  • Blurb: “Joureny to Chicago, bustling metropolis by day and vampire domain by night. Now you can return to the city that started it all, whether as a new vampire struggling for survival on the mean streets, or an ancient elder playing the centuries-old games of power in the Elysiums.”
  • System: Vampire the Masquerade

Die, Grave Robber, Die! by Michael Van Vleet

  • Blurb: “A rain-drenched world of horror and open graves awaits! Can you reach the Flayed House in time to rescue a stolen body before it’s too late?”
  • System: Trophy Dark

Feast by Chris Bissette

  • Blurb: “Deep in the earth it slumbers. Ancient. Unknowable. Patient. It inhales, tugging on the mycorrhizal networks that vein the land, pulling in everything it needs. Life. Sustenance. People. There will be a ritual. The ancient thing will wake.”
  • System: Neutral

The Magonium Mine Murders by James Holloway

  • Blurb: “Strange noises in the mine. Bandits on the roads. A counterfeiting scheme, a crooked prizefight racket, a rebellion in the making … and a cold-blooded murder. Times are hard in the Halbek Valley, and your player characters are right in the middle of it all.”
  • System: OSE (B/X Derivatives)

DCC # 83: The Chained Coffin by Michael Curtis

  • Blurb: “A whispered voice calls from a coffin bound in chains, urging the heroes into the depths of the Shudder Mountains, a place rife with superstition and forlorn secrets. In the shadowy, pine-grown valleys of the Deep Hollows lurk mysteries of a bygone age and a new evil emerging from the ruins of the past. The adventurers must plumb the mountains’ secluded reaches to root out this rising terror before its power comes to fruition. Standing in their path are cackling witches, subtle devils, lingering spirits, and a foul thing that moves in the night. Can the heroes appease that which lies within the Chained Coffin and thwart the dawn of a new and terrible age?”
  • System: 3.x/d20/OGL, Classic D&D/AD&D, Dungeon Crawl Classics

Deep Carbon Observatory by Patrick Stuart, Scrap Princess

  • Blurb: “Players start in the town of Carrowmove, devistated by an unexpected flood, then travel through a drowned land where nature is turned upside down and desperate families cling to the roofs of their ruined homes, hiding from the monstrous products of a disordered world, through the strange tomb of an ancient race, to a profundal zone, hidden for millennia and now exposed, and finally to the Observatory itself, an eerie abandoned treasure palace, where they will encounter a pale and unexpected terror which will seek to claim their lives.”
  • System: Classic D&D/AD&D

Paper Chase by Chaosium

  • Blurb: “the search for a missing professor leads to a grizzly discovery.”
  • System: Call of Cthulhu

Crimson Letters by Chaosium

  • Blurb: “Crimson Letters - The death of a professor at Miskatonic University in Arkham, Massachusetts sets off a chain of events that echo through the entire city. The investigators must solve the unexplained death of the academic before things get out of hand.”
  • System: Call of Cthulhu

Dead Light by Chaosium

  • Blurb: “a chance encounter with a distressed young woman leads the investigators into the hideous aftermath of a crime gone terribly wrong.”
  • System: Call of Cthulhu

The Lightless Beacon by Chaosium

  • Blurb: “a group of investigators who are shipwrecked and washed ashore on Beacon Island, a rocky outcrop in the Atlantic Ocean which is home to an ominously dark lighthouse. Unfortunately for the group, the island has been infested with Deep Ones, and they now face a frantic battle for survival.”
  • System: Call of Cthulhu

None More Black by Chaosium

  • Blurb: “The death of a Miskatonic University student leads the investigators into unsavory neighborhoods and dark business dealings.”
  • System: Call of Cthulhu

The Necropolis by Chaosium

  • Blurb: “What ancient horrors lie slumbering in a newly discovered tomb deep in Egypt’s Valley of the Kings? Are you allowing local superstitions and the unfortunate events surrounding the opening of Tutankhamen’s tomb to play on your mind as you wait to step down into the darkness…”
  • System: Call of Cthulhu

The Secret of Castronegro

  • Blurb: Welcome to the “town of Silver City in New Mexico where there has been a rash of disappearances, including a Professor of Psychology, an anthropology student, and a local man from the nearby town of Castronegro. The clues should lead the Investigators to Castronegro, an odd, out of the way place dominated by two corrupt Spanish families, the de Diaz and the Vilheila-Pereira families, noted for their long teeth, black hair, and vibrantly green eyes.”
  • System: Call of Cthulhu

Servants of the Lake by Chaosium

  • Blurb: “Pursuit of a missing friend finds the investigators sequestered in a roadside motel where not all is as it seems.”
  • System: Call of Cthulhu

Convergence by John Scott Tynes

  • Blurb: “September, 1996. In a small Tennessee town, teenager Billy Ray Spivey vanishes for two days without explanation and comes back changed. When he uses unnatural powers to kill two people, conspiracy theorists blame UFOs. Delta Green has other suspicions. A team of agents heads to Groversville to find the truth, but they may become the next victims.”
  • System: Delta Green

Observer Effect by Shane Ivey

  • Blurb: “Agents investigate a cutting-edge physics laboratory that may have looked a little too deeply into the nature of reality.”
  • System: Delta Green

The Cross Stitch by Foresight Studio

  • Blurb: “discover a missing town that is stuck in a time loop”
  • System: Mörk Borg

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Liminal Horror is developed by Gobin Archives, Josh Domanski, and Zach Hazard Vaupen