Accidental Harrycrux : a question

[justcarol67]

No: HPFGUIDX 155225

Luna wrote:
> > I have a question for you guys:
> > According to Slughorn, in order to create a Horclux, you need to
kill someone and perform some kind of incantation in order to have 
your soul split.
> > According to DD, Voldemort wanted to create his last Horcrux while
killing Harry (note that he intended to do it with Harry's death, not
with James' or Lily's deaths) We know that when Voldemort casted the
killing curse against Harry, it rebounded (thanks to the protection
Lily gave to Harry and that required her won death in order to be
activated), "killing" Voldemort himself...
> > Now, how can a Horcrux have been accidentally created if Voldemort
didn't achieve the killing of the victim in the first place, which, in
theory, is the main requirement for the creation of a Horcrux?
> 

zgirnius responded:
> While Voldemort did not achieve the killing of *Harry* he had just
achieved two other killings, those of Harry's parents. So pieces of
soul for encasement were available. Slughorn did not say the spell was
for splitting the soul-that is an inevitable consequence of murder, as
he explained. The spell is for encasing a soul bit into an object.
>

Carol adds:
I agree with zgirnius (though I wonder if all killings or only murders
result in soul splitting).

But I want to add that DD suspected that LV intended to make his last
Horcrux *with* Harry's death, which is not the same thing as making it
*while* he's killing Harry. I'm pretty sure that the spell to encase
the soul bit in a Horcrux is performed *after* the murder, possibly a
long time afterwards, as would have to be the case if Moaning Myrtle's
or the Riddles' deaths were used to create Horcruxes. (When Tom killed
those four people, he didn't yet know how to create a Horcrux.)

You're right that he could not have used Harry's death to create a
Horcrux since Harry didn't die, but I don't think anyone is arguing
that he did so. They're arguing that a loose soul fragment resulting
from Lily's (or maybe two soul bits from Lily's and James's deaths)
was somehow floating around loose in the air and accidentally got
lodged in Harry when Voldemort vaporized (not a view I agree with,
obviously).

Since the soul must already be split if a fragment is to be encased in
a Horcrux, the spell for encasing the soul bit must logically be
performed after the murder. And since a spell is required, according
to Slughorn, and a spell must be cast deliberately using a wand, I see
no way that an accidental Horcrux could be created. At any rate,
there's no canonical evidence that such a thing can be done. It's
merely being proposed as a mechanism for the transfer of powers from
Voldemort to Harry.

Carol, wondering if the diary (which IMO was not originally intended
as a Horcrux) and the Marauder's Map operate on the same principle,
with a bit of the makers' powers and personality enclosed in the
magical object so that it interacts with the reader as the maker
himself would (handwriting and all), no soul bit required