I can’t remember when they showed Eren having to seal a rock with hardening, flashback or not. It was in season three of Attack on Titan.

What episode is it?

2 Answers 2


In Attack On Titan season 3, episode 8. Eren uses the titan hardening ability to protect his comrades in the underground of the Reis Chapel.

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He isn't sealing a rock thou


The episode you where referring to, is episode 13 of Season 3 Part 2.Titled, The town where everything began.

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