Living Rot

Living Rot drops from the following undead in Eastern Plaguelands:
 * Unseen Servant
 * Gibbering Ghoul
 * Stitched Horror
 * Scourge Warder
 * Dark Caster
 * Overstuffed Golem
 * Hate Shrieker

As a quest objective
This item is used to make Coagulated Rot for To Kill With Purpose.