While many veteran Keepers consider it a "gem" of their collection, it is to run the campaign. The 7th Edition of Masks of Nyarlathotep was significantly expanded by Chaosium to include much of the depth (like the Peru prequel) that the Companion originally aimed to provide.

Additional plot threads and prequel adventures to flesh out the journey.

: Advice on handling travel, currency, replacing lost investigators, and detailed profiles of cults and magical tomes.

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