Cosmos Builder delivers the ultimate guidebook to the construction of a complete multiverse, from dimensions, elements and intersecting planes of existence to spheres, pocket universes and flux realms. Follow along as author Richard Balsley charts the fantastic details of how shadows interconnect between planes and how structures can indeed be larger on the inside than the outside.

Filled with everything needed to create an endless array of locations for even the most advanced role-playing demands, Cosmos Builder is the only guide you’ll need to transform even the most mundane worlds into places of wonder and amazement.

Cosmos Builder is the Seventh Volume in the World Building Archive from the creative mind of Gary Gygax.