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Join Keeper of Arcane Lore Mark Meer and an all-star cast of Investigators as they confront the terrors of the Cthulhu Mythos in Call of Cthulhu Live in May and June 2025. Don't miss out on the world's foremost tabletop game of horror and mystery, live on stage in Birmingham, Brighton, L … read more

QuestWorlds offers a complete, rules-light system focussed on resolving in-play conflicts quickly and easily. It centers around a simple core mechanic and optional rules that allow you to customize your game to suit any setting or genre. Now available in print format (softcover) at DriveThruRPG! Ge … read more

  Our incredibly popular RuneQuest Humble Bundle is back! And in addition to the 18 titles in the original bundle, this special encore edition also includes the Meints Index to Glorantha, plus a 15% discount code valid site-wide at Chaosium.com. Discover sword, sandal, and s … read more

  Who knows the end. What has risen may sink, and what has sunk may rise... Whoa - we're just about to hit 10,000 followers over at Blue Sky, a popular alternative to that other place. Come join us!   @chaosium.bsky.social   UPDATE: And boom, just like that we've sailed past 10, … read more

The Two-Headed Serpent is an action-packed, globe-spanning, and high-octane campaign set in the 1930s for Pulp Cthulhu. The heroes face the sinister conspiracies of an ancient race of monsters hell-bent on taking back a world that was once theirs. And now it is available on Roll20 VTT! Wo … read more

Our community manager Bridgett Jeffries is interviewing GMs from our Cult of Chaos gamemaster program and creators for our community content programs at DriveThruRPG - the Miskatonic Repository (Call of Cthulhu), Jonstown Compendium (RuneQuest-Glorantha), and Companions of Arthu … read more

The 'Unnatural Selections' series is our regular round up of notable Chaosium reviews worth a look. Reviewers and fans alike have described our recent new Call of Cthulhu releases with such terms as "industry-leading", "the gold standard" and "must-have". This warms the hearts of our small but dedi … read more

   Please note, due to a family bereavement, our forthcoming QuestWorlds Q&A has been rescheduled to February 27th. February 27 4PM ET | 9PM GMT | February 28 8AM AET Twitch.tv/ChaosiumInc Ask all your burning questions about the newly-released QuestWorlds! Our Q&A sessio … read more