Inspired a real life horrific child murder.
Sandy Charles, a 14 year-old Canadian Indian boy living on a Reservation in Saskatchewan saw this movie and decided it would be great to be able to fly like the Warlock, so he enlisted the help of a 7 year-old and killed an 8 year-old neighbor, skinned him, and cooked flesh and fat from the victim and ate it. I would guess the flying stuff didn't work. Sandy is now in a Canadian mental hospital.
https://murderpedia.org/male.C/c/charles-sandy.htm