We eventually found out that the walls were made using a titan hardening ability. The reasons why titans were in the walls, was because they formed the walls themselves by using this ability around them.
[Aaaaand there is of course more to that story, such as why and who did it and what if they break out but maybe he will be satisfied with this answer? (Probably not, Hange wouldn't be if the roles were reversed.)]
Back then, Eren eventually managed to master it too. Thanks to him, we were able to patch up holes in the walls and retake the areas we had lost.
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We eventually found out that the walls were made using a titan hardening ability. The reasons why titans were in the walls, was because they formed the walls themselves by using this ability around them.
[Aaaaand there is of course more to that story, such as why and who did it and what if they break out but maybe he will be satisfied with this answer? (Probably not, Hange wouldn't be if the roles were reversed.)]
Back then, Eren eventually managed to master it too. Thanks to him, we were able to patch up holes in the walls and retake the areas we had lost.