In the entire Holy Church, there was only one place which hadn't been explored by him. It was the only room that was left, all because his system warned him against trying to force his way through.
At that time, he was weaker than his current self, so he was quite curious to see if it was still the same case now.
Even though that room felt like a risky place, he had a feeling that it was a risk that he had to take sooner or later.
He followed the Cardinals, occasionally speaking, his words being just as 'innocent' as ever. Even though he could see the Cardinals flaring in anger, they were very restrained for some reason.
"That's quite boring." Eventually, Eren gave up, since the Cardinals didn't look like they were going to attack him.
The Cardinals soon reached the room in the depths of the Holy Church. The signs of a recent explosion had tainted the walls somewhat darker, but it was the only place that hadn't been repaired yet.