Filth fever

Filth fever was a sickness characterized by fever and slowness of movement. It was spread by bites from contaminated animals, such as rats or other sewer animals, and could be deadly if left untreated.

History
In the late 15 century DR, a magically animated puppet of Halaster Blackcloak purportedly researched for a cure for filth fever in the Arcane Chambers of Undermountain, by randomly mixing harmless substances.

Appearances

 * Adventures
 * Waterdeep: Dungeon of the Mad Mage