IN ANY CASE
The last ghost boss was absolutely infuriating. I think he was the spy or something? In one of the notes, someone ends up getting their mouths stitched shut and whatever, but is killed by the Lady while this happens.
And here's how you beat him, the second to last boss of the game easily (as well as Lady)
He has 3 attacks
1. He leans back and then charges at you, turning red and vulnerable
This one is fairly easy to deal with
2. He leans back, and I CANNOT tell if the animation when he does this is in any way different from his bodyslam attack- and shoots binding belts. If you can tell a difference, that will help- which would've been nice for me to be able to know given how annoying the flying belts are. If you are bound by one, you will want to try and stay near him to watch for the next attack, this will prevent you from being double-bound. The belts often land on you as soon as the first one comes off, that or Vosmug is sadistic and wants me ram my hand through my screen.
3. The hand is a VERY fast-moving ghost, as so you can stun it, then attack it. Doing so will have Hand push the flying hand back into the guy for massive damage.
I struggled with him for quite a long time, and just said screw and went aggressive and just stood right in front of him. That happened to end up being the best thing to do... Once you get used to his timings, actually... you want to stand as close as possible to him and attack as soon as he's vulnerable. When he bodyslams, you can stun him. When he calls for those damned belts, you can stun him. When he throws the hand out, well... be about 1/3rd of the screen away from him and that will give you ample time.
Just repeat some number of times and you'll easily clean him out.
When it comes to Lady boss in the realm, I wish I could explain how the hitboxes work, but it still doesn't make sense, and it's super awkward. But, I had good success attacking her from below the beam, and it's very likely that for many frames she's invulnerable. I can't tell, but I would say while the beam fires she seems to be invulnerable, so don't despair when it seems like you can't hit her.
In any case, GHV was just epic. I unfortunately didn't understand a word of the ending and what was going on, and why Hand stabbs Vena. But anyway- it's great.