The Known World of Dungeons & Dragons began taking shape in the B/X edition, making D&D distinct from AD&D, which was set in the World of Greyhawk in the early 80s. My first contact with the Known World was from the map in the D&D Expert Rulebook (1981). By 1990, Mystara (as the Known World … Continue reading HOLLOW WORLD: A D&D Pulp Fantasy Campaign Setting (1990)