Today’s Demon (or daemon) is described as a sinister creature from Hell or the underworld, a beast with ‘divine power’ and the ear of Satan himself.
But it hasn’t always been that way.
Demons were once considered celestial beings, capable of helping others as well as causing harm. Not so much now.
During the Middle Ages, the demon was delegated as an evil creature from Hell by Christians and it all went underground from there.
Now, these inhuman supernaturals are a pop culture phenomena, particularly when it comes to exorcising them. Perhaps the most famous exorcism is that of Linda Blair in the Exorcist. In fact, if you adjusted for inflation, the Exorcist would be the top grossing R-Rated film of all time.
In more recent references, possessed humans have black, blank eyes and do bad things. Like, really bad.
Survival Tip: When a demon enters the human body, the only way to get them out is through exorcism. Thankfully, the Catholic Church is still performing them. So...who you gonna call?