The Encyclopedia Frobizzica

From Enchanter (The Legend of the Unseen Terror):

At one time a shapeless and formless manifestation of evil was disturbed from millenia of sleep. It was so powerful that it required the combined wisdom of the leading enchanters of that age to conquer it. The legend tells how the enchanters lured the Terror "to a recess deep within the earth" by placing there a powerful spell scroll. When it had reached the scroll, the enchanters trapped it there with a spell that encased it in the living rock. The Terror was so horrible that none would dare speak of it.