The tome was made for the sole purpose of increasing Cyric's power. It is well understood that the power of a deity was directly related to the size and devotion of their worshipers. This book was created to turn anyone who read it into a devout worshiper of Cyric and thus would increase Cyric's power. The tome was of great power and once one started reading it, could not willingly stop; it even worked against other deities.