2010 · 资料书（用于增强玩法的规则/选项）
Underdark
This Dungeons & Dragons supplement provides material for adventures and campaigns set in a vast subterranean realm inhabited by drow, mind flayers, dragons, and other threats. It includes new monsters and hazards, ready-to-play encounters, monster lairs, and information on influential factions and figures dwelling below the surface.
基于属性/数值（STR、CON、PER 等）骰子（主要为 d20）等级制（获得经验值并升级）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Underdark
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。