All aboard the Concordant Express! This massive, modron-operated locomotive always departs on time and on schedule, roaring across the multiverse through a network of planar portals. In this adventure, the Concordant Express is carrying precious cargo: an enigmatic, interplanar outlaw known only as the Stranger. The Stranger is wanted for crimes across the multiverse, but as is often the case with such individuals, it’s not what they did—it’s what they know. You have been recruited by the Golden Vault to obtain a list of true names—words of power that can bring powerful angels, demons, and devils to their knees—the Stranger has committed to memory in their planar travels.

“Affair on the Concordant Express” is a fifth-edition D&D adventure designed for characters of 9th level. Players are welcome to outfit their characters with one rare or two uncommon items prior to this heist.