Call of Cthulhu Keeper Companion Set for October 28

A toolkit of optional rules and advice

The Companion is presented for both novice and experienced Call of Cthulhu players. Chaosium lists new methods for creating investigators, a system for creating investigator organizations, revised skills, and optional or streamlined approaches to skill rolls, combat and chases. Sanity rules are also described as revisited.

That catalogue points to a reference book with several possible uses, rather than a single mandatory rules change. Keepers can identify which part would address a need at their table—character creation, organization design, or a procedure that feels cumbersome—before deciding whether to bring a new option into play. The announcement does not say that the Companion replaces the core rules or that every group must use its options.

The book’s listed advice extends to online play and other considerations, scenario design, game mastering, and developing monsters and NPCs. Chaosium also mentions revised investigator and pulp hero sheets and other play aids. The brief announcement does not specify what each aid contains, so it is safer to treat them as categories of material rather than assume particular templates or features.

Three scenarios with different hooks

Chaosium says the book includes three new scenarios intended to showcase its options. “Little Miracles” is described as beginner-friendly, set near Arkham and concerned with a missing Miskatonic University professor. “If I Had a Hammer” starts from a comfortable Friday night at home that becomes a nightmare. “What a Puzzler!” is an investigative scenario tied to a new fad for jigsaw puzzles.

Those short premises offer a first way to compare the scenarios to a group’s next session: a beginner-friendly mystery, domestic horror, or an investigation built around an unusual trend. They do not establish scenario length, player count, preparation time or suitability for a particular campaign. A Keeper choosing among them should wait for fuller descriptions or consult the book rather than infer those details from the announcement.

How current groups can evaluate the book

For an established group, the practical question is not whether every listed option sounds useful, but which specific gap it might fill. If investigators and organizations already work well at your table, those sections may be less urgent than the scenario-design advice or the three adventures. If online play is part of your routine, the listed advice may be of interest, though the announcement does not describe its format or technical scope.

As a cautious table-preparation approach, review an optional procedure between sessions, explain any proposed change to players, and try it in a low-stakes scene before treating it as a permanent house rule. That is reader advice, not a publisher instruction. Keeping one change at a time also makes it easier for a group to judge whether a new approach actually suits its play style.

Release timing and information still to check

The publisher’s dated post says “Releasing October 28th.” Since the supplied evidence is dated September 27 and today is October 6, that is a future scheduled date in this article’s timeframe. Chaosium’s announcement, as supplied, does not give a price, formats, ordering details or confirmation of any later schedule change.

Use the October 28 date as the publisher’s announced schedule, not as a guarantee of current availability. Before budgeting for the book, check Chaosium’s current product information for format, price and status. For now, the confirmed scope is the combination of optional rules, guidance, play aids and three scenarios; readers can decide which of those categories would be most useful to their own table.