The Happiest Killer (discontinued)

This mod has been discontinued due to file errors, but its first version remains playable.

This mod offers a new weapon (a knife) and a new mob called “The Happiest Killer” that will appear in your world to try and kill you, making you feel fear and insecurity.

Spoiler:

Opens and closes doors.
If you look at it or get close, it will kill you.
When you kill it, it will drop its knife.