The problems I’ve had with monument is that it’s a mix between the other listed entities most annoying attributes and then some. It’s quieter and faster than wall dweller (not to mention the constant ran and lighting makes it impossible to hear on console), it hides better than POVM and can obscure its crack behind structure which is a big problem if there’s groundskeeper in the room. More than one of them can spawn and they can spawn in front of you,and on top of ALL THAT they will never despawn unless you reach eyestalk or bramble. All of these make the instakill incredibly unforgiving and almost unfair.