A fallen clock tower holds components from an ancient artifact. Upon discovery of the components, competing agents look to launch expeditions to uncover additional components scattered across distant places—and times. The now-lost Temple of Moloch and the construction site of the legendary Tomb of Horrors are two of those locations. However great the risks, finding the components demands the effort, for whoever does so can reassemble the fabled Infernal Machine of Lum the Mad!

Set in the Radiant Citadel, this is the perfect supplement to your "Journeys Through the Radiant Citadel" campaign, allowing adventurers to explore the ancient city and discover more about its people and places. From the Trade Discal to the Preserve of the Ancients, delve deeper into the secrets of this bastion of wonder and hope. Included in this supplement you’ll find: 10 one-session encounters for characters ranging from levels 2–13 A hand-drawn dungeon map for a new area in the Citadel 3 VTT maps 5 original stat blocks 2 new magic items A printer-friendly version with only essential graphics and text And a host of memorable NPCs! Easily drop an encounter into your existing campaign or build out a new adventure entirely. You’ll find a broad range of themes to help your table bring to life this ancient city in the heart of the Deep Ethereal Plane.