Death's domain is not the afterlife. You can just hang out in Death's mansion and meet people and stuff. It's not paradise, but it's a perfectly fine place to be. The afterlife seems to be some kind of infinite desert where you're alone for who knows how long until you figure out how to talk to the other people wandering it. It's also mentioned that the afterlife is what you expect it to be, so if you grew up believing that you'd go to hell for some minor thing you did, sucks to be you.
IIRC the desert was the passage to the actual afterlife, and not even Death could cross it.
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 120.
Plans for next chapter release:
There is 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.)