This term refers to a specific category of resource material designed to aid individuals in the role of game master, particularly within tabletop role-playing games (TTRPGs). It often contains rules clarifications, adventure seeds, character creation guidelines, world-building advice, and encounter designs. As an example, it can provide detailed descriptions of non-player characters (NPCs) and their motivations for use in a campaign.
Such resources are valuable assets for both novice and experienced game masters. They provide a framework for crafting engaging narratives, managing gameplay mechanics, and improvising scenarios. Historically, these resources evolved from simple rulebooks to comprehensive guides, reflecting the increasing complexity and sophistication of TTRPGs and demonstrating their growth as a hobby and creative outlet. They significantly enhance the quality and enjoyment of role-playing sessions.
