If you've read mouses story the correlation between black Magic and infection is no longer an ambiguous idea, or it's ability to effect mortals, which is pretty much confirmed anyway when Rashid feels it's necessary to examine Harry personally, or list off incidents involving mortals. I think she's quite common, she's the devil in everyone's ear, everyone has a shadow for her to speak through, humans can just override it. Those who can't, quite clearly have their own shadow mirror inside reality to prevent Nemesis room to maneuver.
And thomas became addicted to poison soon after, he craved the love and wouldn't be well fed without it, that's not natural. Nor was Justine's original illness which Kravos likened to a drug addict, which was directly reasoned in book to reduce willpower and allow possession. She acted not only entirely different but in possession of mind reading abilities not natural to what she seems usually capable of. No, glossing over Justine's sickness is blinding oneself to deeper clues, I plain out don't believe medication does anything for her, and despite her tongue and cheek reply in WN that that's why she's normal now, it doesn't have anything to do with it, if she even actually takes medication besides Thomas, whom was literally her medication as per her description of his effect on her. A particularly large dose/bite seems far more likely and proven of an idea. Especially since we encountered another with similar issues in sarrisa... Same issues? Doubt Mab helped her with meds either.

I'm thinking the ghouls have a different purpose, mainly making him m confront his own hatred in opposition of what EB has done with his hatred of Wamps.

I’m not sure it works that way. You have to have the will and belief to cast the spell in the first place, but after that it’s “actions have consequences” time.

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Eb blowing a hole in Harry’s spine is an example

- he certainly didn’t want to, but once let loose, the spell proceeded to its conclusion.

but that's just what it does it seems.. that's why not being burned by your own flame, like Justin, is considered high level skill for instance... Or an overpowering alteration of reality basically. Look at Harry in GP, he stands amidst the flames but isn't truly burned by them. Totally different then what Asher does with her counter spell for instance. Your belief goes into the spell, but most people are not Neo minded to break reality itself. Dogmatic ppl could do it. This is also part of why Harry is so disturbed by the human he kills while fleeing the wild hunt I think.

You should put the summoning circle in the continuity errors thread.

someone pointed out years ago now(cannot remember who) that his circle actually changes from copper to bronze and back to copper before he ever had it upgraded. So yea, something's off about that..

Probability manipulation only goes so far against a constant passive effect.

I'd disagree.. energy expended would be greater than energy naturally flowing. Depending on his technique and efficiency, it would simply require upkeep. He directly effects the Haunts by expending his energy upon them. Or to try to put it in physics, if you apply a force against gravity you can resist gravity, how far and how long you resist it depends entirely upon the methods used to do so. If he can directly exert his will upon the situation he must simply apply the right amount of Dv(thrust) in the right quantity for the right amount of time. Gravity is a constant, a passive effect. Unless they become agitated their effecting tech would remain a constant as well. Look at what harry did in DM, he held it back like a dam and when he let it all go it all flowed out at once. Surely if a few well placed tables and lights can do it, mouse wouldn't have any trouble applying the same technique to similar effect without directly fighting it, just making it flow more smoothly.
And hiya TCF!🤗

Ooohh dear me we arrre in trouble 😁
It seems my theory that his Lab and LC survived came to pass and it didn't go up in the conflagration or blow up when LC released it's energy. 😈 This made me very, very happy...
Harry winning the BFS from Marcone would track up as a nice parallel to Merlin winning Edinburgh btw...

Other than a few Mainstays most of the signatories didn't really show themselves it seemed to me.

In theory, yes? The Murphyonic field has interested me a great deal actually.. I think it has everything to do with the source of Wizardy. Namely Luck itself. If your consider wizards only effect technology, and Ghosts can freely effect technology as well, it becomes a byproduct of their aura. They effect technology because they can effect fate, but since they aren't supposed to by cosmic standards, it manifests as effecting technology. Note that every Law has a direct implication on using magic to abrogate the free will of another. An what's more, the superstition around the souring of milk/leaving it out, was that it attracted spirits which supposedly caused bad luck and focused it into the milk. So wizards souring milk was almost literally them expending their effect into a foci for it.