Relentless Killer
"I met him, 15 years ago; I was told there was nothing left; no reason, no conscience, no understanding in even the most rudimentary sense of life or death, of good or evil, right or wrong. I met this... six-year-old child with this blank, pale, emotionless face, and... the blackest eyes - the Devil's eyes. I spent eight years trying to reach him, and then another seven trying to keep him locked up, because I realized that what was living behind that boy's eyes was purely and simply... evil."
- – Dr. Loomis on Michael Myers
In D&D 5e, the Relentless Killer is a monster from Van Richten's Guide to Ravenloft clearly meant to fill in the role of the classic slasher-movie villain. Coming into being when someone makes a pact with fiendish powers, usually for the sake of revenge, relentless killers exist only to indulge their endless bloodlust. They currently come in two varieties: the Relentless Slasher, and the Relentless Juggernaut. Relentless slashers strike from the shadows and disappear just as quickly, usually focused on a specific person or type of individual, which they pursue with a single-minded obsession (and yes, you can use this as a proxy for actual cannibal Shia Labeouf). Relentless juggernauts forgo the subterfuge in favor of going balls in, tanking hits, and using anything in the surrounding environment as a weapon, so if you're thinking Jason Voorhees, that's a good start.
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Relentless juggernaut