A One-Round Living Greyhawk Nyrond and Her Environs Metaregional Adventure
From the introduction:
Since ancient times, the Phostwood has suffered from the onslaught of a disease that has cursed the Phost trees. Now, like so many of the other nearby forests – the Celadon, the Gamboge, and the Nutherwood – the Phostwood is under a new form of attack. But this time, no blight is to blame. This time it is the trees themselves.
An adventure for [character levels] 10 - 16.