In a few writings, there are also good demons, for example in stories by James Clerk Maxwell, Hesiod and Shakespeare. In Indo-European mythology and traditions of Iranian Avestan and Vedic, the idea of "demons" was there for many years. Ancient Egyptians thought of demons as "monsters" that ate souls of people when they went to the afterlife. In ancient Greek mythology, there are also "daemons" but they were thought to be invisible protectors that they believed protected them. In the book "Northern Lights" by Philip Pullman, a daemon is said to be a creature that everyone has as part of the body. So if it is far away from someone, that person would feel hurt.