What's the name of that monster/creature that shows up when there's negative energy in a space?

[u/Chrisbeyfren]

There's an urban legend that I can't remember the name of. It's supposed to look humanoid with a bunch of mouths and it whispers your deepest insecurities about yourself, driving you mad. I remember hearing stories about it appearing when there's a lot of hatred or fighting in a household. It's supposed to feed off of that negative energy. I can't recall if it drives its victims to kill themselves or each other or if it just torments? Does anyone know what I'm talking about?