Shadows of Yog-Sothoth (Supplement)

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This article is about the Call of Cthulhu supplement. For other uses of Shadows of Yog-Sothoth, please see Shadows of Yog-Sothoth (Disambiguation).


1st Edition
2nd Edition

Publisher: Chaosium

Product Code: 2010 (1st Printing), 2302 (2nd Printing), 2397 (2nd Edition)

Publishing Year: 1982, 1983 (2nd Printing), 2004 (2nd Edition)

Pages: 72 (1st Edition), 176 (2nd Edition)

Cover Price: $9.95 (1st Edition)

Author(s): John Carnahan, John Scott Clegg, Ed Gore, Marc Hutchison, Randy McCall, Sandy Petersen, Ted Shelton

Artist(s): Tom Sullivan (1st Printing and 2nd Edition), Gene Day (2nd Printing), Mislet Michel (2nd Edition), Andy Hopp (2nd Edition)

Setting(s): 1920s

Format(s): Softcover


Campaigns: Shadows of Yog-Sothoth

Scenarios: The Hermetic Order of the Silver Twilight, Look to the Future, The Coven of Cannich, Devil's Canyon, The Worm that Walks, The Watchers of Easter Island, The Rise of R'lyeh, The People of the Monolith, The Warren.

Front Cover Text

A Global Campaign to Save Mankind

Back Cover Text

First Edition, First Printing


The Silver Twilight is an international organization dedicated to the destruction of the human race. As brave Investigators, you must piece together passages from esoteric books, shards of ancient artifacts, and puzzling letters to discover the Silver Twilight's loathsome goals. This multi-chapter adventure begins in Boston and spans the globe. The Investigators must survive and conquer the mind-shattering monsters and minions of the Cthulhu Mythos. Come, journey through awesome realms of reality, and match your wits and sanity against diabolical lurkers in SHADOWS OF YOG-SOTHOTH!

This scenario book includes three new adventures for the CALL OF CTHULHU role-playing game. SHADOWS OF YOG-SOTHOTH is a seven-chapter tale of horror and suspense. Also included are two bonus scenarios: one is suitable for beginners and the other is perfect for experienced Investigators. Eight pages of Player Information include corrections and additions to the CALL OF CTHULHU rules and a very special centerfold!

Second Edition

The Rise of forgotten R'lyeh. Cthulhu sleeps in the corpse city of R'lyeh. Through unblinking eyes he watches mountains grow and empires rise and fall. He lays quiet, unmoving. Now he stirs. He senses that the stars are right once again converging into their proper formations. His Worshipers have plotted for the day when their might lord once again walks the earth. That day has come!

Shadows of Yog-Sothoth presents a grand seven-part campaign, revealing details of the Silver Twilight, an international organisation dedicated to forcing the premature rise of R'lyeh and the release of the dread Cthulhu.

Comments / Trivia

Dedicated to Joseph Payne Brennan

First Edition, First Printing

Printed in 'burnt umber' ink with an impressive double page centre spread of a shoggoth attacking a fishing vessel.


Holy Texts of the Silver Twilight

Spoilers - Keepers Eyes Only

Players should not read any further.

See the Keeper section in the Shadows of Yog Sothoth Campaign article