2019 · ソースブック（プレイを拡張するルール／オプション）
Mountains (CoC)
This supplement focuses on mountain environments, adding rules and ideas for altitude, falls, rockslides, cliffs, and other hazards. Investigators may pursue a fleeing cult leader through a dangerous pass or race across the mountains to reach their destination. It also includes a new occupation, mountain-related equipment, and 100 random encounters for use in these settings.
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。