Pumpkinhead

In the original 1988 film, the summoner, Ed Harley, eventually starts feeling the pain and seeing the actions of the demon as it kills its targets. A modern feature could expand this into a mechanic or narrative device:

: Every injury Pumpkinhead sustains is reflected on the summoner’s body, but in a non-lethal, decaying way. If the demon is shot, the summoner develops a weeping wound that smells of pumpkin patch rot. Pumpkinhead

: The summoner doesn't just see the kills; they are forced to experience the fear and memories of the victim right before they die. This emphasizes the theme that "when you seek vengeance, you become the monster". In the original 1988 film, the summoner, Ed