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If Edward could affix his brother's soul, why not his mother? Did it require
seeing the 'truth' to do so? Does that mean the other empty armor suits
(Barry) had another person who had seen the truth affix them?


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2016-04-03T20:04:37.117
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question
fullmetal-alchemist-series
Why didn't Edward affix his mother's soul to the suit of armor?


Edward couldn't affix his mother's soul, because she was already long dead. It
isn't made so obvious, but actually a few years pass between the mother's
death, and then the boys training with Izumi, before they try and resurrect
her. He was able to attach Al's soul to the armour because it was still
present, in the body of the creature they tried to transmute. The mother's
soul had long since departed, and couldn't be used in alchemy.

When the mother died of her illness, we can assume Ed never considered putting
her soul into another object, and even if he did he wouldn't have known how,
and probably would not have had the alchemical skill to do so anyway.


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2016-04-03T20:48:38.293
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Because he didn't know how to at the time.

When Ed and Al first tried to bring their mother back and Al was lost in the
2003 series, when it shows him working to get Al's soul back, he says to
himself that he didn't have much time. Later, when someone (probably Winry or
one of Mustang's team) sees the seal on Al's armour and asks if it was blood,
he confirms it's his own blood because he didn't have a lot of time. This
would indicate that the soul's passing through the Gate needs to be recent, if
it is to be bound to an object.

Secondlly Ed would eventually learn that the seal is by no means a long term
solution

> Although never mentioned in the 2003 anime there is an even greater danger;
> if one's soul is bound to an inanimate object for too long, the soul and
> object will eventually start to repel each other. The person will start to
> experience moments of exhaustion, which cause that person's soul to
> disappear from the object, as stated by Al, who compares his body to a time
> bomb. This can lead to the complete destruction of the soul as it slips away
> to The Gate. This makes the blood rune only a temporarily effective
> technique.

Source: [Blood Rune - Negative
Effects](http://fma.wikia.com/wiki/Blood_Rune#Negative_effects)

Remember that in the _Brotherhood_ series the time since Al was bound to his
Armour is between 2-4 years. (There are 2 years between their attempt to bring
back their mother and Ed going to Liore, and however long the series
progressed until Al compared himself to a time bomb, which I roughly guess to
be 2 years.) Thus, this would only give Trisha a couple more years to live.

Finally even if Ed knew the process and accepted the limited time Trisha would
have as a soul bound to an object, a soul bound to a suit of armour is not
what they wanted. They wanted their mother fully restored back to how she was.
Remember that one reason for their search for the Philosopher's Stone was to
restore their bodies, and that Ed always said the first person to be restored
would be Al, even if Al gained some benefits as a soul bound to armour, which
Greed (mistakenly) revealed.

> A person whose soul is bound to an inanimate object feels no pain, hunger,
> or fatigue, thus enabling them to perform immense physical feats. Also, as
> the person has no body, he or she can sustain more damage than normal
> humans, placing the person in a state of high invulnerability.

Source: [Blood Rune - Positive
Effects](http://fma.wikia.com/wiki/Blood_Rune#Positive_effects)


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2016-04-03T22:55:19.730
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2016-04-04T15:17:21.767
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Few thoughts, that were not covered in existing answers.

It seems, that manipulating souls is actually not common knowledge in alchemy,
since it was not even practiced much. Aside of Alphonse, there were only two
subjects, whose souls were attached to objects, both created by scientists,
that were researching philosopher stone. Even if Ed and Al were able to
recover some knowledge of human transmutation, there was no way for them to
learn, how to manipulate human soul.

Taking that into account, I'm pretty sure Edward didn't know how to attach
soul to object until the very moment they opened Gate of Truth. It was
actually knowledge he received from Truth, same to his technique of
transmuting without circles.


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2016-04-12T10:19:04.090
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2016-04-14T22:52:59.490
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answer


Alphonse soul never left the mortal world, it bounced into the creature they
made, then ed put it into the suit of armour from the dying body they
transmuted.


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