From publisher blurb:
Level-6 D&D 5e + Shadowdark Adventure
Rot in the Myth Well is an adventure that takes place in Freymeadow Vale. The ambitions of a mortal man named Clint Jobben drove him to delve with forces he did not understand. He messed with the Myth Well, an ancient Elvish shrine that holds great power and feeds the land with life. Clint ignored the horrible consequences and lost his life without ever witnessing the chaos he unleashed. Time is of the essence as the corruption spreads through the vale, mutating animals and ruining harvests...
Sheldon Moore, a famous writer, feels guilty because Clint was his friend. And he believes he could have done more to stop his madness. The only way to undo this is by performing the Dance of Barks, an ages-old ritual that requires the seven sacred barks, found in Freymeadow Vale towns. Sheldon and his personal bodyguard offer a hefty reward and their help to gather the sacred barks. The next step is to delve into the dungeon and find a way to learn the ritual, the Dance of Barks.