fractalman comments on Harry Potter and the Methods of Rationality discussion thread, part 23, chapter 94 - Less Wrong
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|Aren't horcruxs supposed to be incredibly costly to create?
I'm afraid you'll need to find MoR evidence for that, not Cannon evidence. Eliezer rearranged a lot of the details on how Dark Magic works-basically, some rituals, but not all, twist your mind as an explicity price, and it's often dangerous, but rarely is it truly Evil in and of itself.) He has been very carefull not to make it obvious what the new price or prices for horcrux creation are-except that it still requires a murder. If he's dropped hints that give more than a +/-5% boost to any particular hypothesis, I haven't noticed them as such.
Eliezer has added details of how magic works, but I don't think he's intentionally changed anything from canon.
He has.
Eleizer has: changed the fundamental mechanism for the patronus, made dementors killable with patronus 2.0, edited the magic interactions between Harry and Voldemort to be dangerous to Harry as well as Voldemort, changed how the elder wand works (It's...maybe a +5 wand under normal use, and is only an "infinity+/-1" wand when fed blood sacrifices), and made Harry's invisibility cloak work against dementors-Cannon!Dumbledore (or...someone) warns Harry explicitly that invisibility cloaks do not work against dementors.
I'd have to check the bit about Harry's invisibility cloak not working against dementors--I don't recall that from canon but if so that is indeed a change. Do you have a specific cite in canon where the invisibility cloak does not work against dementors?
Patronus 2.0 is simply a new spell, not a change to an old one. I don't recall the fundamental mechanism for the Patronus 1.0 charm has changed, but if you have cites from canon and HPMoR to back up this claim, it could prove your point.
The magical interactions between Harry and Voldemort are different, I suspect, because HPMoR Voldemort did something different to Harry than canon Voldemort.
The elder wand is an extension of canon, not a change. I don't think there's anything in canon that contradicts what HPMoR says about it. I read the blood sacrifices as being an additional source of Grindelwald's power, not something required to power the elder wand. I.e. he had the elder wand and the blood sacrifices. And if I'm wrong about that, I'm still not sure it would contradict canon.
on the first one, according to http://harrypotter.wikia.com/wiki/Dementor
My original point about patronuses turned out to be more hair-splitting than anything else...but it also turns out that Rowling's take on the partronus totally diverges in lesser-cannon.
In that book, a guy called Raczidian tries to cast a Patronus. He produces, instead, a swarm of maggots....Which turn and eat him up.
MoR "dark-wizards" simply find that the spell fizzles.