Shadow

A rather unusual and minimalist monster appears in Minecraft with the Shadow mod. This dark creature has a skin colored entirely black except for a bloody mouth slit. The creature will appear in the darkest corners of the block universe (the author calls this place your soul). As soon as you do something wrong, like commit crimes, the Shadow will immediately appear next to you and hunt your soul. Therefore, you shouldn't steal from Villagers or harm them, or you might not survive. Don't forget to enable Experimental options in your world settings.