"...The gugs, hairy and gigantic, once reared stone circles in that wood and made strange sacrifices to the Other Gods and the crawling chaos Nyarlathotep, until one night an abomination of theirs reached the ears of earth’s gods and they were banished to caverns below. Only a great trap-door of stone with an iron ring connects the abyss of the earth-ghouls with the enchanted wood, and this the gugs are afraid to open because of a curse."
The Dream-Quest of Unknown Kadath