2025 · ソースブック（プレイを拡張するルール／オプション）
Cults of the Mythos
This roleplaying supplement presents 23 cults devoted to forgotten gods, strange sciences, alien forces, and dangerous Mythos knowledge. The cults span different places and periods, from secretive organizations protecting forbidden books to groups seeking wealth, power, or human potential. Game Masters can use the cults as ready-made elements for Mythos scenarios, while players can introduce their characters to them. Rules track a cult’s rise, fall, wealth, influence, and special stunts, with additional detail for organizations referenced elsewhere and several new groups.
スキルベース（スキルを購入または獲得）ダイス（主にd6）属性／ステータス制（STR、CON、PERなど）
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。