2007 · 资料书（用于增强玩法的规则/选项）
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.
技能型（购买或获得技能）基于属性/数值（STR、CON、PER 等）等级制（获得经验值并升级）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 The Book of Unremitting Horror (D20 Version)
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。