Published across multiple editions, Masks of Nyarlathotep tasks investigators with unraveling the Carlyle Expedition, a globe-trotting journey to stop the awakening of the Crawling Chaos. However, the original text is famously dense. Critics and players have noted that its 1980s design philosophy—relying on linear clues hidden in large blocks of text—often leads to investigator paralysis or TPKs (Total Party Kills). The Companion, compiled by the "Masks of Nyarlathotep Companion Team" and edited by Adam Gauntlett and Paul Fricker, emerged from decades of community playtesting. This paper posits that the Companion is not merely an addendum but a necessary prosthetic, correcting historical inaccuracies, deepening NPC motivations, and providing structural scaffolding for a modern audience.
This Companion draws on decades of community discussions, actual plays (including The Old Ways and How We Roll), and essays from the Masks of Nyarlathotep Keeper’s Facebook group. No material is intended to infringe on Chaosium’s copyright — this is a non‑commercial, fan‑made supplement.
For the official Masks of Nyarlathotep campaign, purchase the current edition from Chaosium.
Masks of Nyarlathotep is legendary for its scope, but it is also infamous for its structural flaws. In the original versions, clues were missing, connections between chapters were tenuous, and Keepers were often left asking, "How do the players even know to go to the next location?"
The Companion addresses this head-on. It provides the "connective tissue" that was missing. It explains how the chapters link together, fills in plot holes, and offers logical reasons for why the investigators would travel from New York to London to Cairo to Shanghai. It takes the guesswork out of the Keeper's prep.
Have you used the Masks of Nyarlathotep Companion PDF in your game? What was your favorite handout or alternate scene? Let the community know in the comments below—and may Nyarlathotep’s thousand masks show you mercy.
Further Reading:
Stay sane, Keepers.
The Masks of Nyarlathotep Companion (MONC) is widely considered the ultimate community-driven guide for running one of the most legendary RPG campaigns ever written. Originally a collaborative fan project on the Yog-Sothoth.com (YSDC) forums, this mammoth supplement grew into a professional-grade volume spanning over 700 pages. What is the Masks of Nyarlathotep Companion?
The Companion is a massive resource designed to augment the world-spanning Call of Cthulhu campaign, Masks of Nyarlathotep. While the original campaign provides the plot and core locations, the Companion offers a "deep-dive" into historical authenticity, providing Keepers (Game Masters) with:
Historical Detail: Exhaustive research on 1920s life in locations like New York, London, Cairo, Kenya, and Shanghai. masks of nyarlathotep companion pdf
Expanded Scenarios: Additional plot threads and prequel adventures to flesh out the journey.
Enhanced Props: Hundreds of high-quality handouts, including realistic newspaper clippings and maps.
Keeper Advice: Practical tips from veterans who have run the campaign over its 30+ year history. The "Sand Bat" and "Bloody Tongue" Editions
The book went through several iterations during its development and eventual limited release:
Bloody Tongue Edition: Often refers to early draft versions (e.g., version 0.9) shared during the project's development.
Sand Bat Edition: The definitive hardcover and PDF version released by Chaosium and Sixtystone Press following a successful 2015 Kickstarter. Current Availability of the PDF
Help finding Masks of Nyarlathotep Companion : r/callofcthulhu
The "Masks of Nyarlathotep Companion" is a legendary resource in the tabletop roleplaying community. Originally created as a fan project by the community at Yog-Sothoth.com (YSDC), it grew into a mammoth 700+ page tome of advice, Keeper resources, and expansion material. It was designed specifically to support what many consider the greatest roleplaying campaign of all time: Chaosium's Masks of Nyarlathotep.
Whether you are a seasoned Keeper or preparing to run this massive campaign for the first time, understanding the history, contents, and digital availability of the Companion PDF is crucial. What is the Masks of Nyarlathotep Companion?
The Masks of Nyarlathotep campaign is famous for its complexity. It is a massive, globe-trotting sandbox where player characters investigate a cult conspiracy spanning several continents in the year 1925. Keeping track of hundreds of NPCs, clues, and timelines is a monumental task for any game master (Keeper). Masks of Nyarlathotep is legendary for its scope,
The Companion was born out of the collective wisdom of Keepers who had run the campaign over several decades. It includes:
Keeper Advice: Deep dives on pacing, managing player death, and tracking complex clue networks.
Historical Context: In-depth dossiers on the real-world 1920s locations featured in the campaign, providing sensory details to bring the era to life.
Pre-Written Scenarios: Brand-new side adventures and a prequel to help onboard players or give them a break from the main plot.
Expanded Handouts: Hundreds of incredibly immersive, high-quality prop mockups, newspaper clippings, and telegrams. The PDF Availability Maze
Finding a legitimate digital copy of the Masks of Nyarlathotep Companion PDF can be incredibly confusing due to its unique publishing history. The Original Editions
The project was funded via a highly successful Kickstarter in 2015 to support the YSDC community hub. Digital versions were circulated to backers under names like the "Bloody Tongue Edition" or the "Sand Bat Edition". Masks of Nyarlathotep Companion special Sand Bat edition
Masks of Nyarlathotep Companion is a massive, fan-created supplemental PDF (and later physical book) designed to enhance the legendary Call of Cthulhu
campaign. Often described as a "masterpiece of fan labor," it was primarily developed by the Yogsothoth.com community. Core Content & Value
The Companion serves as an exhaustive toolkit for Keepers, expanding the base campaign with hundreds of pages of additional lore, NPCs, and mechanics. Deep Lore Expansion: Further Reading:
It provides extensive historical context for each location (New York, London, Cairo, etc.), helping Keepers bring the 1920s setting to life with more than just the scripted encounters. NPC Flesh-Out:
Dozens of minor NPCs from the original text are given full backstories, motivations, and expanded stat blocks, making the world feel reactive and inhabited. New Side Quests:
It introduces several "interlude" adventures and side plots that can be woven into the main narrative to provide variety or help investigators recover Sanity. Keeper Utilities:
Includes detailed advice on managing the campaign’s complex timeline, travel logistics, and the "meat-grinder" lethality for which is famous. Critical Perspectives Reviewers typically highlight the following pros and cons: The "Gold Standard" of Props:
One of its most praised features is the collection of high-quality, period-accurate handouts, including newspapers, telegrams, and maps that go far beyond what was included in earlier official editions. Information Overload:
A common critique is that the sheer volume of information (over 500 pages) can be overwhelming. It is widely considered essential for "completionist" Keepers but may require significant filtering to avoid slowing down the game. Compatibility:
While originally designed for older editions (like the 4th or 6th), the lore and narrative advice remain highly relevant for the 7th Edition Slipcase Set from Chaosium , though stat blocks may need slight conversion. Availability Note
Because it was a community-driven project with licensed assets, its official availability has shifted over the years. You can often find legacy discussions and files via Yog-Sothoth or community forums like Are you planning to run the campaign for the first time , or are you looking for specific handouts from the Companion?
Which one is recommended? I want to buy one and translate it. 21 Sept 2017 —
Each chapter gains:
