One of the strengths of Masks is its cast of memorable NPCs. The Companion provides "dossiers" on key characters, giving Keepers deep insights into their motivations, secrets, and relationships. This allows for better roleplaying and improvisation when Investigators inevitably go "off-script."
Published across multiple editions, Masks of Nyarlathotep tasks investigators with unraveling the Carlyle Expedition, a globe-trotting journey to stop the awakening of the Crawling Chaos. However, the original text is famously dense. Critics and players have noted that its 1980s design philosophy—relying on linear clues hidden in large blocks of text—often leads to investigator paralysis or TPKs (Total Party Kills). The Companion , compiled by the "Masks of Nyarlathotep Companion Team" and edited by Adam Gauntlett and Paul Fricker, emerged from decades of community playtesting. This paper posits that the Companion is not merely an addendum but a necessary prosthetic, correcting historical inaccuracies, deepening NPC motivations, and providing structural scaffolding for a modern audience.