2007 · 资料书（用于增强玩法的规则/选项）
Grendel Spawn
This advanced class supplement introduces Grendel Spawn, deadly predators that hunt humans with powerful jaws and other dangerous abilities. It includes class abilities, eight new feats, and rules for adding them to a d20 Modern game.
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 Grendel Spawn
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。