Pumpkinhead

: To maintain the summoner's control, they must offer a "piece of their soul" or a physical sacrifice to the witch Haggis every time they want to redirect the demon, making the cost of revenge tangible and escalating.

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: 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". : To maintain the summoner's control, they must