FTP, what are these spirits sometimes associated with caves and mines
One example of this type of mythological creature is Goldemar, who sees the secret sins of the clergy.  Other named examples include Hodeken, who frightens unfaithful wives, and Biersal, who will clean jugs and bottles as long as he receives his own jug of beer for his work.  In general, they are mischievous household spirits of German folklore who will perform chores unless outraged by not being properly fed.  FTP, what are these spirits sometimes associated with caves and mines whose name is the source for the word "goblin"?
One example of this type of mythological creature is Goldemar, who sees the secret sins of the clergy.  
kobolds