The Mimic

You often feel lonely in this world, and that feeling brings sadness. But after installing The Mimic mod, loneliness will seem not so bad. With this add-on, you'll constantly feel like you're not alone in the Minecraft world. A Mimic entity will appear in the block universe. This entity spawns naturally, opens doors, and most importantly, always watches you. If you look at it, it will blind the player and cause nausea with a terrifying sound. The mob can be killed, but you must be constantly prepared for confrontations. Don't forget to enable Experimental options in the map settings.