2007 · ソースブック（プレイを拡張するルール／オプション）
A Cthulhian Miscellany
This supplement expands the horror role-playing system with optional rules and additional material for investigators and Keepers. It includes specialized skills, new spells, books, magical artifacts, insanities, Mythos creatures, non-player characters, psychic vampire guidelines, a sample vehicle, and other game elements. The contents can be used with settings and supplements spanning the 1890s through the modern era, with some material adaptable to the Dreamlands, Dark Ages, and other periods.
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。