"In all my years of research, perhaps the best way I have found to summarize the Hermit of Wither Tor is the name given to him by the inhabitants of the Grassdancer ghettoes. These unfortunates call him, in their own tounge, AnÃ‚Â´rah GrunÃ‚Â´dar Ahr, which roughly translates into He-Who-Speaks-With-His-Fists....."
From "Locastus and beyond", by Darius Moak
The dark wizard of Locastus, now long dead and gone….. Or is he?
An unsavoury character, yet immensely useful to know if you are in need of urgent medical attention, but want to avoid the eyes of the authorities….
A plague has hit the local area.
In humans it affects only the most vulnerable, the children and the very old, and even than it's little more than a summer cold. 24 hours of sniffles and then it's gone, barely noticeable really.
To sheep however it is fatal and the whole economy of the area is in serious trouble. If this keeps up the area could well be facing famine.
Somebody (enter the PCs) must find the rare herbs needed to make a cure.