Return to the Keep on the Borderlands

Return to the Keep on the Borderlands is a 1999 adventure module for Advanced Dungeons & Dragons (AD&D) written by John Rateliff. Set two decades after the original B2: The Keep on the Borderlands, it updates and expands the classic dungeon-crawling scenario with new threats in the Caves of Chaos while retaining the iconic structure of the fortress outpost. As a game master's guide rather than narrative fiction, its content is presented as tactical encounter data, maps, and plot hooks for players to explore.