A One-Round Eberron Adventure for 5th-level Characters
From the introduction:
Matron Martra has done further investigation into what the Diggers’ Union recently uncovered below Sharn (see EMH07: The Delirium Stone) and has concerns. Her research suggests that the recovered stone may in fact be disastrous if activated — stirring more dreadful attention that the Union doesn’t need. Because the PCs were involved in its recovery, Matron Martra asks them to deal with the problem.