2002 · 资料书（用于增强玩法的规则/选项）
Codex Mysterium (d20 3.0)
This d20 supplement expands magic and spellcasting for fantasy campaigns, with particular ties to the Sovereign Stone setting. It introduces rules for creating custom spells, casting spells from memory without restudying them, and combining the power of multiple wizards. The book includes more than two hundred spells for Elemental and Void mages, new prestige classes, and additional rules for spell creation. It also details the setting’s battle-mages, elven Wyred, mage guilds, Nimran priests, and dwarven Firemages, while remaining usable with other d20 System campaign settings.
- 人数
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基于种族（玩家的种族/物种影响游戏玩法）骰子（主要为 d20）骰子（多种）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Codex Mysterium (d20 3.0)
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。