"Heart of the Forbidden Forge" is set in the Eberron campaign setting. The PCs learn of a creation forge that was once buried and abandoned, but no longer. They'll need to fight their way through goblins, constructs, and undead, and contend with old traps before finally meeting the true power behind the forge. If the PCs have been through the events in "Seekers of the Ashen Crown," this adventure can be easily slotted after that one has concluded. The adventure works fine for other PCs as well, and it can be adapted easily to another campaign setting. For five 7th-level characters.