The Mimic Add-on 1.21+

Often, we feel lonely in this world. This feeling truly brings sadness and doesn't please us. But after installing the mod The Mimic, the feeling of loneliness won't seem so bad. With this addition, you will constantly feel like you are not alone in the world of Minecraft. The Mimic will appear in the block universe.

This entity spawns naturally, opens doors, and most importantly, will always be watching you. If you look at it, it will blind the player and induce nausea with a terrifying sound. The mob can be killed, but you must always be prepared for encounters.