23796


I'm currently only watching the anime. I hardly read the manga but I'm very
curious as to how humans become titans. Is it by some kind of drug similar to
the one Eren was injected with by his father?


CC BY-SA 3.0
2015-08-04T10:52:13.633
23795
2022-02-21T04:57:03.347
2015-08-04T16:15:08.953
63
15299
question
attack-on-titan
How humans became titans?


This contains major unmarked spoilers if you've only watched the anime, as
will the linked questions.

* * *

In Eren's case, it's through a particular serum that his father injected into
him just after the fall of Shiganshina, shown in chapter 71 of the manga. This
serum was stolen from the [true royal
family](http://shingekinokyojin.wikia.com/wiki/Category:Reiss_family) by
Eren's father, and is used to allow the subject to turn into a titan. As well
as Eren, Rod Reiss is also shown as being able to transform after he has some
of the serum:

> "...he himself scrounges the fluid off the floor[...]. After ingesting it,
> he turns into a gigantic Titan considered by Levi and Armin to be bigger
> than the Colossal Titan."
>
> [Rod Reiss](http://shingekinokyojin.wikia.com/wiki/Rod_Reiss#Story) on the
> SnK Wiki

Certain humans that are also 'titan shifters' seem to have this ability
inherently, or at the very least, it hasn't been covered as to where they
gained it - this includes the likes of Annie, Reiner and Bertholt.

Additionally, if a titan shifter is eaten, a titan with a human inside will
gain the ability to shift between two forms. This is evident in the case of
Ymir, discussed in [**this
question.**](https://anime.stackexchange.com/questions/17210/how-does-ymir-
turn-back-into-her-human-form)


CC BY-SA 3.0
2015-08-04T11:47:43.157
23796
2015-08-04T12:24:08.890
2020-06-17T09:17:53.303
-1
10654
23795
answer