2026 · シナリオ／アドベンチャー／モジュール
Keeper Companion
A rules and advice supplement for Call of Cthulhu, with options for creating investigators and organizations, revised skills, and streamlined rules for skill rolls, combat, chases, and sanity. It also offers guidance on online play, scenario design, and running monsters and non-player characters, along with revised character sheets and other play aids. Three scenarios introduce the book’s options: a missing professor near Arkham, a quiet evening that turns frightening, and an investigation tied to a jigsaw puzzle craze. Intended for mature players.
ソースブック（プレイを拡張するルール／オプション）スキルベース（スキルを購入または獲得）属性／ステータス制（STR、CON、PERなど）ランダム属性生成（キャラクター作成時）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。