A look into Grisha's memories shows Eren the many secrets his father was hiding, including one which led to his mother's demise.
--No... I still haven't 
deciphered most of it.
.كلاّ... ما زلت لم أفكّك تشفير معظمها
Ach, das meiste
kann ich kaum entziffern.
No. No descifré casi nada.
Je n’en comprends
que des bribes, en fait.
In realtà ne ho decifrato
solo una piccolissima parte.