2023 · 资料书（用于增强玩法的规则/选项）
Monster Mash: Monster Classes for Basic-Era Games
This Old-School Essentials-compatible supplement lets players take the roles of monsters rather than traditional dungeon-delving heroes. It includes 13 horror-themed classes, including golems, cat folk, ghosts, haglings, hobgoblins, revenants, shadow elves, shades, werewolves, wererats, vampires, profane necromancers, and gothic witches. The book also adds new spells for several classes, along with occult powers and ritual spells for gothic witches.
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 Monster Mash: Monster Classes for Basic-Era Games
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。