In chapter 84 of Attack on Titan,

Levi decided to inject Armin with the Titan serum to have transformed the almost dead Armin into a Titan so he can consume Bertholdt to gain his Colossal Titan's abilities.

Why doesn't Levi just inject both Armin and Erwin with half of the serum each so both survive?

  • The issue of quantity doesn’t really play that big of a role (I think) because when Rod just licked the serum he transformed into a Titan. Maybe that was because of his royal blood but you can see that the amount of serum in the syringe is quite a lot and even if the Titan ends up like Connies mum they could still feed the Titan a Titan shifter and let it wonder for a while until that day comes. Apr 11 '20 at 4:46

A question that we should also think upon: Would Erwin have wanted Levi to turn him into a mindless Titan just so he could 'live'?

Remember that the Titan injection turned Armin into a Normal Titan, not a Titan shifter. He still needed to eat Bertolt afterwards. If both turned into Normal Titans, only one would still be able to inherit the Colossal Titan. There has been no precedence in the manga nor a mention of an event where two people inherited the same Titan powers but a person may acquire multiple Titan shifter abilities.

Besides, as seen in Chapter 84 and to quote from the wiki, Levi himself did not want to bring back Erwin, even if there was a way:

Levi notes that Erwin became a demon just as they had wished, and that he deserves to rest, rather than be brought back into their hellish world.

So, no, only one would still survive.

  • But couldn’t the other just be left to wander until the armoured or beast Titan was defeated so they can eat him or even the cart Titan (or whatever the name is I’m not so sure). Apr 12 '20 at 21:36
  • @Loading...But were they in the condition to secure and capture a Titan during that time? And if they left it wandering around, how are they supposed to find it back? And they run the risk of Zeke controlling the Titan and turning it on them, which is a psychological advantage since there is a chance they would hesitate attacking a comrade, even if he was in a mindless, titan form. Zeke can also order other titans to just kill the other if left wandering around.
    – W. Are
    Apr 13 '20 at 1:35

I can't remember if anyone, Levi included, actually saw when he tasted the serum, did they? And either way, there was one guarantee to get one of them into action, or a chance to get both, but if it didn't work for any reason, everyone would get ripped apart or eaten alive. I watched the show, so could have missed some info from the manga, but sounds like good reasoning to me.

  • Eren saw it and was right there when the decision was being made. Apr 12 '20 at 21:36
  1. IIRC, Levi didn't know if they needed to have the whole serum injected or just a part, so risking it would potentially kill them both.
  2. Levi knew Erwin wished to die.

Only a little bit of the serum is needed to transform an Eldian into a pure titan. To become a titan shifter, however, a pure titan needs to ingest the spinal fluid of a person who is already a titan shifter.

That means that both Erwin and Armin could have survived. All they had to do was inject both of them with the serum and feed them each half of Bertholdt. The only problem is the possibility that there is not enough of Bertholdt's spinal fluid to go around for Erwin and Armin to both transforms into titan shifters and gain the power of the colossal titan.


They only had one titan shifter that is Berthold. Even if Levi injected both of them, one of them had to be a mindless titan. If they had successfully captured both Berthold and Reiner, both of them would have been injected.

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