is there an advantage to having a human Horcrux?

I believe so. Chapter 102:

Alsso Merlin'ss Interdict preventss powerful sspells from passing through ssuch a device, ssince it iss not truly alive.

By which I infer that if the horcrux is alive, you can pass powerful spells through it.

Also, that whole discussion simply screams of Quirrell setting Harry up for a ritual where Quirrell will transfer his mind to Harry's body, and set up shop there, the end.

Harry musing on what Q might have done to the Pioneer Plaque:

“Or... hm. A portrait seems to store a whole human brain’s worth of information... you couldn’t have added any extra mass to the probe, but maybe you could’ve turned an existing part into a portrait of yourself? Or you found a volunteer dying of a terminal illness, snuck them into nasa, and cast a spell to make sure their ghost ended up in the plaque.

Q later describing the Horcrux spell.

Horcrux sspell channelss death-bursst through casster, createss your own ghosst insstead of victim'ss, i

... (read more)

Harry Potter and the Methods of Rationality discussion thread, January 2015, chapter 103

by b_sen 1 min read29th Jan 2015174 comments


New chapter, and the end is now in sight!

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 103.

There is a site dedicated to the story at, 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

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Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).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.