Hey everyone! I've been wondering lately how one could implement serial killers, psychopaths, etc. into a traditional fantasy RPG such as Pathfinder or D&D. I question whether it can be done because, unless the PCs are low level, a killer's dagger is barely going to scratch them. I wouldn't want to just give the murderer some Magic Murder McGuffin that gets the job done super easily, but I still want to have some sense of terror and fear and have the killer be a legitimate threat. Any thoughts/ideas are appreciated.