2017 · 战役设定（游戏世界）
Underworld Kingdom Volume One: Explorers of the Unknown
A campaign booklet for old-school fantasy roleplaying campaigns, set in an underworld inhabited by explorers and otherworldly beings. It adds rules and guidelines for abilities, a new character class, options for existing classes, off-worlders, mutations, death, and insanity. The booklet also includes 200 random names, quirks, prophecies, mutations, and equipment lists for use during play.
资料书（用于增强玩法的规则/选项）基于属性/数值（STR、CON、PER 等）等级制（获得经验值并升级）职业制（飞行员、巫师、科学家等）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Underworld Kingdom Volume One: Explorers of the Unknown
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。