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The Lair of Lothysss


The Lair of Lo'thysss is a Call of Cthulhu 7th Edition encounter location suitable for 1920s or Modern games. The location is an in-depth lair of a Serpent Person enclave with many curiosities and horrors to discover. The leaders of this group could serve as allies, neutral associates, or adversaries for investigators. 

What do I get in The Lair of Lo'thysss?

  • A detailed 31-page encounter location for players to explore
  • Two NPC personalities that could be allied or serve as foils for each other.
  • Options to use the location as a current threat or relic of the past
  • Multiple rooms to explore with varied curiosities
  • Monstrous tech to discover and potentially replicate
  • New Serpent poisons and elixirs
  • A weird computing interface
  • Frightening new Mythos creatures
  • A new Mythos tome
  • Lots of advice for how to pick the options that will work best for you as a Keeper
  • Playtest notes
  • Handouts (maps, technology, NPCs) and Keeper aides that can greatly reduce your prep time
  • Fully linked Table of Contents
  • Bookmarked PDF
  • A "Behind-The Scenes" of a piece of artwork

This product acts as a standalone product, or as a robust enhancement to the 7th Edition Call of Cthulhu scenario Test Subjects, available for purchase at this link:

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Original electronic
Scanned image
These products were created by scanning an original printed edition. Most older books are in scanned image format because original digital layout files never existed or were no longer available from the publisher.

For PDF download editions, each page has been run through Optical Character Recognition (OCR) software to attempt to decipher the printed text. The result of this OCR process is placed invisibly behind the picture of each scanned page, to allow for text searching. However, any text in a given book set on a graphical background or in handwritten fonts would most likely not be picked up by the OCR software, and is therefore not searchable. Also, a few larger books may be resampled to fit into the system, and may not have this searchable text background.

For printed books, we have performed high-resolution scans of an original hardcopy of the book. We essentially digitally re-master the book. Unfortunately, the resulting quality of these books is not as high. It's the problem of making a copy of a copy. The text is fine for reading, but illustration work starts to run dark, pixellating and/or losing shades of grey. Moiré patterns may develop in photos. We mark clearly which print titles come from scanned image books so that you can make an informed purchase decision about the quality of what you will receive.
Original electronic format
These ebooks were created from the original electronic layout files, and therefore are fully text searchable. Also, their file size tends to be smaller than scanned image books. Most newer books are in the original electronic format. Both download and print editions of such books should be high quality.
File Last Updated:
June 27, 2021
This title was added to our catalog on June 27, 2021.