The term 'ASSAYER's Stuff' refers to ORE, which is a naturally occurring mineral or rock that contains valuable metals or minerals. ORE is typically mined and then processed in order to extract the valuable metals or minerals. An ASSAYER is a professional who is responsible for analyzing ORE samples to determine their composition and value. ASSAYER's Stuff is the ORE that an ASSAYER would analyze in order to determine its composition and value.