Much like the Jonstown Compendium for RuneQuest: Roleplaying in Glorantha and The Companions of Arthur for material set in Greg Stafford’s masterpiece of Arthurian legend and romance, Pendragon, the Miskatonic Repository for Call of Cthulhu, Seventh Edition is a curated platform for user-made content. It is thus, “...a new way for creators to publish and distribute their own original Call of Cthulhu content including scenarios, settings, spells and more…” To support the endeavours of their creators, Chaosium has provided templates and art packs, both free to use, so that the resulting releases can look and feel as professional as possible. To support the efforts of these contributors, Miskatonic Monday is an occasional series of reviews which will in turn examine an item drawn from the depths of the Miskatonic Repository.
Monday, 3 November 2025
Miskatonic Monday #393: From the Library of the Playhouse
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It is true to say that titles such as De Vermis Mysteriis, Unaussprechlichen Kulten, and of course, The Necronomicon lurk in the darkest corners of our collective gaming consciousness—and even beyond that, promising knowledge and power of the most profound and revelatory nature. Each exposes truths as to the nature of the cosmos and humanity’s place within that cosmos and the power to manipulate the cosmos, as well as the secrets of those who seek such power, who despite the revelations of humanity’s insignificance in cosmos still want to lord it over them, and who want to manipulate the universe in ways that no sane man would. Yet they also offer salvation if the reader is prepared to pay the price to his equilibrium and overcome the difficulty of finding and gaining access to works of such a dreadful and blasphemous nature that they have in the past, been banned, burned, locked away, or simply hidden. Let alone the fact that such a book might require the reader to know Latin, Ancient Greek, Arabic, or an obscure or lost language in order to read it. For as much as they offer truths that can set a man on the road to arcane and awful power, they may offer another man the means to thwart those who would tread such a path. Drawn from the imaginations of authors including H.P. Lovecraft, Robert E. Howard, and Ramsy Campbell, they have appeared in fiction numerous times and in gaming likely as many times, if not more. The influence of Call of Cthulhu in spreading the names of such Mythos tomes cannot be underestimated and perhaps the best sourcebook for describing what they are, what their significance is, and what they contain, remains The Keeper’s Companion vol. 1.
From the Library of the Playhouse: a catalogue of Mythos tomes presents another sixty-five new titles that lie in wait, ready to illuminate, inform, and inculcate the overly curious and the immoderately ambitious. Most entries in the supplement are a page long each and most are illustrated, often to chilling effect such as the Prophecies of Cizin, written in Myan glyphs incised on human skin whilst the owner was still alive and later flensed, the illustration showing that skin hanging up.
 
Every tome is given a title and details of the language it was written in, who wrote it, and when. This is followed by a detailed description and the roleplaying game stats. They include the ‘Sanity Loss’ incurred for reading the book and the possible amount of ‘Cthulhu Mythos’ skill gained in the process, both the amount gained from an initial reading and later prolonged study. The ‘Cthulhu Mythos Rating’ represents the percentage chance of a reader finding a specific reference in a Mythos tome, whilst ‘Study’ is the actual needed to read the tome from start to finish. ‘Suggested Spells’ gives the spells that might be found in a Mythos tome, for which the Keeper will need access to the Call of Cthulhu Keeper’s Rulebook. In addition, The Grand Grimoire of Cthulhu Mythos Magic will also be useful. Some entries have their own spells, new to Call of Cthulhu, Seventh Edition. Lastly, each entry is categorised according to its ‘Rarity’ from ‘Common’—available in most book shops or libraries, to ‘Unique’—there only being one known copy.
The supplement is organised by era. These are Prehistoric (before 3000 BCE), Ancient (3000 BCE–499 CE), Medieval (500–1499), Early Modern (1500–1799), Late Modern (1800–1945), and Contemporary (1946 to present). The collection opens with Echoes of Eternity, the billions of years old pattern within the radiation left over from the Big Bang that might truly be understood only by reading the notes made by the Mi-Go and if thoroughly read might end in the instant death of the reader and ends with the Unknown Data Crystal found in the Polaris system in the twenty-third century that if meditated upon, will give answers to astronomical or navigational questions. In between, The Writing on the Wall can be found on great blocks of marble in the Australian desert, written in languages from far away, but encoded within is a hidden message that if read, will swap the reader’s mind of the Yithian scientist who wrote and allow him to escape his species’ doom; the Incolae Profundorum, a book found in the wake of the Venice floods of 1966 and which to this day remains damp and smelling of mould and salt and which describes the great benefits of aquatic civilisations; and the Isi Aldranna, the Norse runes carved into the hull of a Viking longship found quite well preserved found in an ice cave that tell the story of its great voyages, the inference being that they took the crew far beyond given that one of the spells it imparts is Brew Space Mead! There are versions of Marlowe’s Doctor Faustus and Edmund Spenser’s Excursions into Faerie, and even The Book of Uncommon Prayer, whilst Le Culinaire Macabre is a book of macabre recipes written by the notorious ‘Cannibal Chef of Lyon’ that if cooked and eaten provide surprising benefits. Zimmer’s Marchen is a coda to Grimm’s Fairy tales, providing very much darker interpretations of the German folktales; Quaint and Curious Tales of Bodmin Moor collects Cornish tales of witches and the Devil and causes the reader to dream after reading a story of being visited by a witch, different each time, who offers the dreamer a new spell; and Brearley's Railway Time Tables and Assistant to Railway Travelling for September 1892 is so comprehensive a collection of railway timetables and local travel details that includes routes and stations that do not yet exist and includes the spell Ghost Train! Jahrila Phool—or Flowers of Death—is a cheap pulp novel in Hindi that imposes its plot upon the reader’s life; Hawker Brothers Ltd.’s Super Fun Party Time Activity Book is a children’s puzzle book with bizarre geometric join-the-dots puzzles (example included) and Oперация Mышеловка—or Operation Mousetrap—is set of microfilm canisters containing kompromat material on a large number of foreign dignitaries, celebrities, and world leaders performing unspeakable rites from just up until Glasnost and subsequently lost in the fall of the Soviet Union. Perhaps the weirdest is Nettleton’s Gourmet Alphabet Soup, a cheap, but popular brand of alphabet pasta shapes in tomato sauce that when heated forms messages of either forbidden knowledge or tips for cooking the perfect soup! The most delightful entry is An Ultharian Treasury: Prose and Poesy of Catkind, a collection of songs, stories, and poems from the literary and folk traditions of the Cats of Ulthar from The Dreamlands, all telling of their triumphs over the vile entities of the Mythos and meant to impart lessons of morality or practicality to young kittens. Of course, such tales are best appreciated when performed orally and in the language of Cat!
Threaded through the supplement, effectively serving as chapter or era breaks, is Ex Libris. This is a classic cautionary story of the dangers of taking too much of an interest in strange books. The conceit is that it takes place at the same theatre where the Miskatonic Playhouse—actually a podcast that performs content from the Miskatonic Repository—performs its plays. In addition, the first of two appendices summarises all of the Mythos tomes in the book, whilst the second provides a set of tables to ‘Build Your Own Tome’.
The second appendix does highlight the issue with From the Library of the Playhouse. One of the tables allows a Keeper to roll for the affiliation of the Mythos tome. However, there is no such affiliation listed for actual entries in the supplement, which would have made them easier to use. Physically, From the Library of the Playhouse is well presented and laid out, though it does need an edit in places.
From the Library of the Playhouse: a catalogue of Mythos tomes is an engaging showcase of invention and creativity. Its entries are as much additions to the Mythos as new iterations of it and its influence, but above all, it is a collection of potential hooks that might spur further creativity on the Miskatonic Repository. There in lies a challenge. How many of its entries will form the basis of new scenarios?

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