Eldritch

Eldritch Horror refers to a creature or entity that is unfathomable, beyond human comprehension, and often associated with the Cthulhu Mythos. Eldritch Horrors are typically ancient, immensely powerful, and exist beyond the limits of time and space.

Adventures

Chaosium

Call of Cthulhu

Cthulhu: Masks of Nyarlathotep

A globe-spanning, apocalyptic campaign of horror and mystery. Unravel cult plots, face cosmic threats, and save the world. If you can survive the madness.

Chaosium

Call of Cthulhu

Cthulhu: Dead Light

Dead Light is a short, encounter-based scenario for Call of Cthulhu, set in the Arkham countryside during the 1920s.

Chaosium

Call of Cthulhu

Cthulhu: Saturnine Chalice

An invitation leads to a strange house, a haunting presence, and a descent into Dreamlands horror in this gaslight-era one-shot.

Chaosium

Call of Cthulhu

Cthulhu: Haunting

Investigators are hired to discover the truth about the Corbitt House in this legendary introductory scenario for Call of Cthulhu 7e, celebrated by Keepers and Investigators for years.

Chaosium

Call of Cthulhu

Cthulhu: Keeper Rulebook

Master mind-shattering horror in this 40th anniversary edition of the Keeper Rulebook. Everything needed to run Call of Cthulhu 7e: rules, Mythos lore, monsters, magic, and adventures.

Chaosium

Call of Cthulhu

Cthulhu: Mythos Bundle

Start your investigation with the core rulebooks.

Books

Chaosium

Call of Cthulhu

Cthulhu: Masks of Nyarlathotep

A globe-spanning, apocalyptic campaign of horror and mystery. Unravel cult plots, face cosmic threats, and save the world. If you can survive the madness.

Cthulhu Reborn

Scion

Apocthulhu SRD

Survive a post-apocalyptic wasteland haunted by cosmic horror. Use this open SRD to run bleak one-shots or full campaigns inspired by Lovecraftian end-times.

Chaosium

Call of Cthulhu

Cthulhu: Through the Ages

Investigate cosmic horror across time: play Cthulhu in the Dark Ages, Victorian London, Ancient Rome, the Future, and beyond with this system-bridging sourcebook for every era.

Chaosium

Call of Cthulhu

Cthulhu: Dead Light

Dead Light is a short, encounter-based scenario for Call of Cthulhu, set in the Arkham countryside during the 1920s.

Chaosium

Call of Cthulhu

Cthulhu: Saturnine Chalice

An invitation leads to a strange house, a haunting presence, and a descent into Dreamlands horror in this gaslight-era one-shot.

Chaosium

Call of Cthulhu

Cthulhu: Haunting

Investigators are hired to discover the truth about the Corbitt House in this legendary introductory scenario for Call of Cthulhu 7e, celebrated by Keepers and Investigators for years.

Chaosium

Call of Cthulhu

Cthulhu: Dark Ages Setting Guide

Uncover Mythos horror in the year 1000 AD. This standalone Call of Cthulhu variant takes investigators into the medieval past, where ignorance offers no protection from ancient terror.

Chaosium

Call of Cthulhu

Cthulhu: Pulp Cthulhu Rules

Punch evil cultists, leap from burning zeppelins, and defy the Mythos with grit and guns. Add this supplement to any 7e campaign to shift the tone toward high-stakes, fast-paced adventure.

Chaosium

Call of Cthulhu

Cthulhu: Alone Against the World Bundle

3 Solo Adventures in Call of Cthulhu 7e

Chaosium

Call of Cthulhu

Cthulhu: Keeper Rulebook

Master mind-shattering horror in this 40th anniversary edition of the Keeper Rulebook. Everything needed to run Call of Cthulhu 7e: rules, Mythos lore, monsters, magic, and adventures.

Chaosium

Call of Cthulhu

Cthulhu: Grand Grimoire of Mythos Magic

Harness over 550 Mythos spells of forbidden power in this eldritch tome. A definitive source of magic for Call of Cthulhu 7e, featuring Deeper Magic, Dreamlands rites, and sorcerous secrets.

Chaosium

Call of Cthulhu

Cthulhu: Mythos Bundle

Start your investigation with the core rulebooks.

Ghostfire Gaming

D&D 5e

Sebastian Crowe's Guide to Drakkenheim

Major content module for the Drakkenheim

Chaosium

Call of Cthulhu

Cthulhu: Alone Against the Tide

A mysterious death on Beacon Island draws you into a solo Lovecraftian investigation filled with creeping dread and submerged secrets.

Chaosium

Call of Cthulhu

Cthulhu: Investigator Handbook

This essential guide for Call of Cthulhu players allows you to create compelling characters and explore the 1920s. It includes expanded rules, occupations, skills, equipment, and historical context.

Chaosium

Call of Cthulhu

Cthulhu: Malleus Monstrorum - Cthulhu Mythos Bestiary

This two-volume collection is packed with ideas, concepts, and insights to immerse your scenarios and campaigns deep in the heart of the Cthulhu Mythos.

Chaosium

Call of Cthulhu

Cthulhu: Alone Against the Flames

Your journey to Arkham goes up in smoke when your train takes a wrong turn into horror. Don't sit too close to the fire.

Chaosium

Call of Cthulhu

Cthulhu: Arkham Setting Guide

Explore the twisted history of Arkham, Massachusetts: home to Miskatonic University and secrets best left buried. A richly detailed setting guide for Call of Cthulhu 7e campaigns.

Chaosium

Call of Cthulhu

Cthulhu: Alone Against the Dark

A globe-trotting solo campaign to save the world from icy destruction. Time is running out... and so are your investigators.

Chaosium

Call of Cthulhu

Cthulhu: Alone Against the Frost

Stranded in the icy Canadian wilderness, your survival depends on ancient secrets, bitter cold, and your will to live.

Chaosium

Call of Cthulhu

Cthulhu: Cults of Cthulhu

Explore Cthulhu’s worshippers through time with this definitive guide. Create your own cults, unravel conspiracies, and run three dark scenarios for Call of Cthulhu 7e.

Chaosium

Call of Cthulhu

Cthulhu: Basic Rules

Play Call of Cthulhu for the first time with this Quick-Start Rules guide.

Join the adventure

Quickly create a campaign, invite your friends, and start playing right away with hundreds of scenes, maps, and sounds at your fingertips.