Plague

This spell allows the cleric to inflict a virulent, infectious disease on a single target. If the target makes a save vs. spells, there is no effect. If the save fails, the target immediately suffers an attack of plague, becoming feverish and disoriented with illness for six turns. During this time, the victim loses 10% of his original hit points, loses one point of Strength and Constitution, and suffers a -2 to saving throws and “to hit” rolls, and is +2 to be hit.
All creatures (and characters) within 10 feet of the victim must pass a constitution check or contract the plague themselves. Creatures currently suffering from the plague cannot contract multiple cases, and creatures within range of more than one victim need check only once.
When the plague attack ends, the penalties end, but lost hit points and ability scores take 1d6 days to return. Before the plague’s effects wear off there is one final attack, and the victim must make a constitution check against his lowered score. If this fails, the victim dies; if the victim survives, lost hit points and ability scores return.