“The Mask of Nyarlathotep Companion” is a fan produced supplement for the most celebrated campaign for the Call of Cthulhu roleplaying game, “The Masks of Nyarlathotep”. The companion dwarfs the campaign book by several hundred pages. “The Complete Masks of Nyarlathotep” was printed in 1996 is 224 pages, while the companion is a staggering 730…