The thing is with every mob in any game that is to be “feared” and “respected” is that eventually people will get accustomed to that mob’s existence.
I can tell you for a fact that deerclops was designed to be one of those “uh oh” mobs where the players fear him strolling up to their base and casually destroy it, with high damage and health to boot.
Nowadays, people are more scared of someone eating the deerclops eyeball instead of deerclops himself. He’s the Day 30 piñata party.
I can promise you that the same thing is going to happen with the warden, initially he’s gonna be super frightening to encounter, but once you get accustomed to him, you will find ways to either dispose of him or outright ignore him.
It’s theoretically hard, or nigh-impossible to create this type of mob in any survival game.
For reference, you can also look at the cannibals in The Forest, and most horror games people play on YouTube. After hitting the 59th jumpscare, players tend to get more annoyed rather than scared.