This week on the Vintage RPG Podcast, we talk about the Campaign Sourcebook and Catacomb Guide (1990), the first Dungeon Masters Guide expansion for second edition Dungeons & Dragons. That might sound dull, but I promise you, it is a wild ride into the substrate of the RPG psyche — it’s one part deconstruction of the hobby and one part a kind of everyperson’s treatise on RPG design theory, written largely by the always engaging Jennell Jaquays. A lot of folks think the blue and silver books are just 2E bloat, but this one should be on the shelves of anyone who thinks deeply about RPG design.