2004 · 资料书（用于增强玩法的规则/选项）
Monster Geographica: Underground
This supplement compiles 200 monsters from underground environments, including 92 classic 3.0 creatures updated for 3.5 rules and material drawn from more than a dozen sources. It supports random encounters, adventure building, and campaign design with creatures organized by challenge rating, keeping monsters of the same difficulty together for quick reference. An alphabetical contents section also lists creatures by type and subtype, with entries arranged by challenge rating.
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 Monster Geographica: Underground
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。