The bloodlines had never disclosed the actual timeline of their society. They limited themselves to reveal the existence of the ancestors and that they had been forced to retreat when the Heaven Tribulation killed them.
Noah and the others knew that those events had probably happened millennia in the past, but the structures of the natives were amazing in fending off magical beasts.
There was a chance that they hid secrets that the Elite cultivators didn't want to reveal and that they didn't bother to retrieve during their escape.
Of course, the trio didn't have high hopes for that mission, but they felt like exploring the world after spending almost three years in the area with the blue forest. There wasn't much left to discover and catalog in that territory, so they decided that it was time to move.
Each of them had their reasons to explore too.
