Demon Wind is a 1990 American horror film directed by Charles Philip Moore. The film concerns a group of friends who travel to an old farm, and soon find they cannot leave as a mysterious fog sets in.[1]

Synopsis
In 1931, a body is burned on a cross. On a farm, a woman named Regina attempts to barricade a door, from where beyond, demons try to enter. Her husband George transforms into a demon instead and kills her.

Sixty years later, after the suicide of his father, a young man named Cory, the grandson of Regina and George, and his girlfriend Elaine, along with a group of their friends, travel up to the farm, so that Cory can figure out what happened to his grandparents. They are attacked by a band of vicious demons. When the kids try to escape, a mysterious fog brings them back to the farm, protected by a shield that prevents the demons from entering the house. One by one, the kids become possessed by the demons, but manage to fight them off with a pair of daggers they find, which is the only thing that will kill them.[2][3] Eventually only Cory and his girlfriend Elaine remain alive. The two discover that Cory is able to defeat the evil by transforming into a higher being. The battle nearly ends them both, but they are able to win. As they flee and return to civilization a possessed townsperson watches them from the hills, implying that they did not completely defeat the evil.