the Yitsútyr was a tan paste refined from the venom of the Yitsútyr, a large clam native to cold freshwater lakes, closely related to the Yitsú, despised as a dangerous pest by fishermen. YitsÚtyr was prepared by immersing the clams in hot salt water, inducing them to secrete the oily venom as a protective measure. Some of the oil floated to the surface, where it was collected. The oil was then boiled in vegetable oil with flowers of sulfur and finely ground charcoal. The sticky YitsÚtyr paste collected on the container's walls. YitsÚtyr killed by destroying the victim's lungs.
Original form in MERP:Jitsutyr