Castle Merciless. Home of He who dwells in nightmares.
Just off the craggy cliffs of Corundum, under the rippling blue ocean waves, seven stones stand. They rise majestically from the ocean floor, references to some long ago civilization. Meaningless, now, to all but the most learned.
There are many scret places in the old forests; the least of which is by no means Old Stone Face
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.