From the Mournlands with Love: An Eberron Story

About the adventure

On the 20th of Olarune, 994 YK, an unknown magical holocaust wiped out the nation of Cyre. There are conflicting theories about the initial start point and spread of the Mourning, but by day's end most of Cyre was covered in a gray miasma and most of the inhabitants within its borders were dead or horrifically transformed. The Mourning did not seem to have an impact on undead and constructs, besides creating new undead, and most warforged also seemed to be unaffected by the mists. The lands inside the Mournland were also transformed; entire cities shifted locations and terrain was raised or lowered, or transformed into glass or other materials. The Wayfinders guild has offered up a substantial reward to anyone willing to explore, document, and act as cartographer over the blasted landscape. This effort is in part attempt to find safe passage through miasma of the Mournlands and return any other findings that would then aid future recovery and restoration missions.