Hyacinthus

Dude i'm in chapter 1 and istg the opening is similar to "the earth is online" webnovel.AND the black tower intro is also basically the same!

"Six months ago, tens of thousands of black phantom towers appeared all over the world, floating above the cities. Chemists, physicists, religious people… all of them could do nothing."
This is literally the 1st paragraph of the earth is online's summary

"In the first few months, people wearing white research uniforms came to the bottom of the black tower every day. They moved some large instruments and checked for unknown things. Now they only came to check once every three days, and the stores near the black tower resumed their operations."
And this is a quote from the first chapter

I agree with one of the comment here that everything in here that's abt women/female are always abt rape and how it was lazy at best harmful at worse.Honestly even if you don't think the stereotypical(idk how to spell) torture/punishment/revenge being rape is problematic,you can admin that it was as lazy as it would come.
So! Hereby i'm here to recommend a few torture methods shirayuki could use

1.basically mini asylum
Have you ever watch those videos abt torture method of shoving someone in a box,locking it and put on the barney the purple dinosour song on loop? Yeah basically that.

2.slow-mo carnivore action
Basically,since shirayuki apparently could get his hands on anything,i suggest he get some sort of small animal,maybe even microscopic carnivore organism and just dunk half of the body of his target in the space he put the carnivore organism in.So that slowly they Will get eaten alive,while being scared shitless.It Will be painful,and it gives him time to get on with his Monologue while already starting the target's suffering.

3.Trauma haunting
Search for the target's trauma,then slowly but surely sprinkle it on their surrounding.Like,if they are scared of dogs bcuz of some event.At first sprinkle things that remind them of that instance/trauma like a photo here,a Splatter of blood there.Then make it so that they look like they are crazy in front of everyone they tell abt it to.Before long,get them in the Woods then chased them as if he is the cause of the trauma.Lure them into a barn and lock them in the barn with their source of trauma...
Honestly i haven't thought the continuation of so yeah.That's all i've got... For now