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At first I thought that you must hurt yourself in order to transform into a
titan.

But later,

> We see that Reiner and Bertholdt transformed without self harm, because they
> transformed immediately after Mikasa cut them in episode 6 of season 2
> (episode 31 on Crunchyroll).

Also, thinking back, Eren did not commit self harm when he transformed from
within the belly of the titan in season 1.

We see also that sometimes Eren is hurt and he still cannot transform, even
though the injury _was_ self induced. What **exactly** must take place in
order to transform?


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attack-on-titan
What is the catalyst necessary to transform into a titan?


As per Attack on Titan
[wikia](http://attackontitan.wikia.com/wiki/Power_of_the_Titans)

> In order to transform, a human with the power of the Titans must suffer an
> injury that draws blood (often self-harm) while having a solid goal or
> belief in mind at the moment of injury.

You can check when Eren was training with Levi in the castle, he discovered
that only injury is not sufficient.

_when he transformed from within the belly of the titan in season 1._  
In that scene you can find that all the above conditions are met.  
1\. Eren was injured( his hand was cut)  
2\. He has solid goal in mind. i.e to defeat the titan

You can read more cases/conditions in the wiki link I provided


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I just want to say that, this might not hold, but the way I saw it when he
transformed in the belly of the titan was that maybe he transformed because he
wouldn't have gotten his arm bitten off if it weren't for his self-sacrifice.
This was my explanation of how that counted as self harm.


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2020-05-28T15:30:43.840
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in season 1 epi 23 annie put a metal ring before she transform into a titan,
so yea i think it does required a metal to activate a titan form and in epi 19
while eren is eating he's spoon drop a remember something and once he got the
metal he transform into a titan without any reason or being hurt


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