Chaosium announces Encyclopedia Cthulhiana for October 2026

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New book features an essay, the origins of gods and monsters, timelines and a bibliography on the Cthulhu Mythos.

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Chaosium has announced Encyclopedia Cthulhiana, a guide to the Cthulhu Mythos scheduled for retail release on October 28, 2026. The book was presented as a resource for cosmic horror enthusiasts, players and researchers interested in the Lovecraftian universe.

The publication will include the essay “What is the Cthulhu Mythos?”, written by author Dan Harms. It will also explore the origins of the gods and monsters that are part of the Mythos, bringing together information on the central elements of this mythology.

The planned contents also include timelines of the Necronomicon and the Cthulhu Mythos itself. Encyclopedia Cthulhiana will also feature a bibliography of cosmic horror texts, expanding the book beyond an overview of the characters and entities in this universe.

The book is positioned as a reference work for those who follow the Mythos across different formats, with material suited both to research and to use by players. Chaosium, known for Call of Cthulhu, did not provide further publishing details in the announcement, such as the price or format.

The publisher also announced Call of Cthulhu: Old Ones Origins, a new board game based on the Cthulhu Mythos. The announcement did not include additional information about the project, such as its release date, rules or components.

For now, the date confirmed by Chaosium is the retail release of Encyclopedia Cthulhiana on October 28, 2026.

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