Keeper's Compendium: Blasphemous Knowledge & Forbidden Secrets by Keith Herber and published by Chaosium Inc. is a role playing game supplement for the company's Call of Cthulhu horror role playing game based on the works of H. P. Lovecraft.
The version reviewed is the printed softcover book. The supplement is not currently available in either PDF or new print, but existing copies can still be obtained. It is unlikely that it will be released as a PDF in the future, as the contents were augmented and, together with new material, formed part of the later publication, The Keeper's Companion, Vol 1, which is currently available in both PDF and print on demand from RPGNow..
Forbidden Books is the first section and is getting on for half the supplement. The majority of this section covers 24 Mythos books, more if the different versions of some of the tomes are counted, giving more detail on the various standard Mythos tomes. There is also a two page essay, A Brief History of the Written Word, and one page of New Mythos Tomes, which has another 40 books. These are all books that had been mentioned in the works of H. P. Lovecraft and others, some of which have also been covered in other supplements, but not in the main rules. They are, unfortunately, not covered in anywhere near the same level of detail that the previous tomes were.
The next section, Secret Cults, gives descriptions of eight mythos-related cults, including some histories, beliefs and non-player characters. This section also has also has some details on new mythos writings, as well as some new spells. Concluding the section is one page of The Thurston Papers, a collection of writings related to Lovecraft's The Call of Cthulhu and having been written by several people who survived that story.
The final section, Mysterious Places, covers fourteen places, including the most well known sunken continents, lost lands and cities, with the final entry, Yuggoth and Beyond, not simply covering one place, but seven different ones including Yuggoth and other stars.
Keeper's Compendium in Review
The table of contents is actually more useful than that of many Call of Cthulhu supplements, as many of the entries are listed in it, but it is still not as helpful as it could be, as there are various additional entries which would be helpful to have indexed. There is no overall index, as is also common. As a result, the navigation of the book is not as easy as it could be.
The art in the book is all black and white, and there are a number of illustrations, many, but not all, relating to the nearby text; there are probably more illustrations than is typical for a Call of Cthulhu supplement, although there aren't any maps or NPC images in this one. The supplement still contains a lot of text.
For the next three sections, Secret Cults, Alien Races and Mysterious Places, the details on the various mysterious items covered is of interest, but is not truly significant. Some new information is given, but not enough to be truly useful in-game without further expansion. Many of these are covered in more detail in other supplements, although having this information is interesting, and there are some new spells, monster details and Mythos writings that will be useful as-is.
Although the Keeper's Compendium is primarily designed for Call of Cthulhu, it could still be useful for other, similar Lovecraftian settings, even those which do not use Basic Role Playing, or derivatives, as their game system, but modification would need making to the game stats in such cases. Keeper's Compendium is not a location supplement, nor is it an adventure book, it is a collection of interesting items in one place, and some expansion of existing ones, that does have the ability to add depth to a game.
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(price as of May 31, 2016)