Fetid Skulls drop from Scourge Champions while engaged on the quest  .
A provided for the quest is used to determine if that particular skull is a (owner participated in the Battle of Darrowshire) or not. The skulls that do not resonate are turned into .
Patches and hotfixes
Patch 2.2.0 (25-Sep-2007): Fixed a bug that had to do with the Mystic Crystal which did not actually destroy the fetid skull, allowing for a player to acquire just one skull and use the crystal until they tired of it.