In Monster of the Week, hunters face terrifying creatures and unravel eerie mysteries. With the Codex of Worlds, those stories get even bigger—expanding your game across new timelines, alternate realities, and wildly different genres.

This supplement builds on the core game, introducing powerful tools to redefine how your team operates and where your adventures take place. Whether you're suiting up for interdimensional conflict or unraveling arcane secrets in haunted mansions, the Codex of Worlds opens the door to a multiverse of supernatural hunting.

Requires the Monster of the Week core rulebook to play.

Inside, you’ll find:

• 15 unique Team playbooks, each reshaping your group’s dynamic with new allies, shared moves, and powerful resources. Become covert operatives as the Agents in Black, protect the fabric between realities as Guardians of the Borderland, or patrol deep space as the Interdimensional Crisis Team. With over a dozen options, you can tailor your game to a wide range of tones and genres.

• Five new series frameworks that drop your hunters into bold new settings:

  • Survive a prehistoric land ruled by beasts in Bone Spear.

  • Explore the living secrets of a sentient home in This Strange Old House.

  • Open gates to fantasy worlds and alien dimensions beyond the known.

Each framework includes customized rules, new Threats, setting-specific guidance, and a ready-to-play Mystery to kick off the action.

And if you're crafting your own universe? Use the built-in advice and tools to design alternate realities and compelling group dynamics that fit your vision.