This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 81, which should be published later today. The previous thread passed 400 comments as of the time of this writing, so it will pass 500 comments soon after the next chapter is posted, if not before. I suggest refraining from commenting here until chapter 81 is posted; comment in the 12th thread until you read chapter 81. After chapter 81 is posted, I suggest all discussion of previous guesses be kept here, with links to comments in the previous thread.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.) When posted, chapter 81 should appear here.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight,nine, ten, eleven, twelve.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it’s fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that “Eliezer said X is true” unless you use rot13.
Dementors don't act like death incarnate, though. Death isn't reactive to human expectations and sensibilities. Death doesn't go out of its way to try to destroy people. Death is just a force of nature (or, rather, the point at which a force of nature terminates). Dementors act like a superstitious anthropomorphization of death.
We also know that there is a dark ritual that summons Death, which Quirrel knows but is afraid to perform.
We know, too, that spells modify reality based on the caster's understanding of the natural world, rather than using the most simple and nature-compliant approach.
I have a very strong suspicion that the first dementors were created by the ritual that Quirrel spoke of. They are a fearful, human-imagined depiction of death, created by the spells of primitive wizards who didn't understand death's impersonal and causal nature. What I wonder, though, is whether casting that ritual is the ONLY way to create new dementors, or if they are also capable of reproducing on their own once summoned. According to the books, dementors can reproduce via a mysterious process that bathes the countryside in fog, but Yudkowsky's dementors are already quite different from Rowling's. It may be that their numbers remain constant unless someone uses that dark ritual to create more of them or a spell like Harry's ubertronus to destroy some.