2007 · ソースブック（プレイを拡張するルール／オプション）
The Book of Unremitting Horror (D20 Version)
A sourcebook for d20 horror campaigns, featuring thirty unusual creatures shaped by human vice, greed, and the darker side of everyday life. Each horror includes its own legend, motives, behavior, origins, special abilities, and the forensic clues it leaves behind, presented through diary entries, articles, and transcripts. The book also includes The Final Case, an adventure that puts these horrors into play.
ダイス（各種）クラス制（パイロット、ウィザード、サイエンティストなど）スキルベース（スキルを購入または獲得）
無料・Web、Android、iOS対応
LudoyaでThe Book of Unremitting Horror (D20 Version)を遊ぼう
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。