Covered in fetid, weeping sores, trollhounds are carriers of a debilitating contagion known as bloodfire fever. Creatures that contract the disease through the bite of a trollhound experience deep internal pain, as if their blood were on fire. Additional symptoms include loss of muscle coordination, pus-filled blisters, and overall lethargy and fatigue. Other than suffering from skin irritation, both trolls and trollhounds are immune to the major effects of the disease.