This sword was forged in the ancient past at the request of a soldier who had to destroy an evil magician who had gained immortality.
The weapon to all appearences will appear to be a +5 sword until in battle when a qualified person swings the suddenly heavily unbalanced sword.
Plain looking dagger. However, when the dagger is seen in the light of an open flame Jamil’s hand print is on the hilt from where he gripped it in his death.
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.