Quote Originally Posted by Vyrerus View Post
None of that knowledge is completely lost, because most of it made it to modern day. "Ruins" completely intact from those time periods, too. Hell, constructs still around from all those time periods, too! Archaeology in this setting is like a penultimate master class in getting ahead.

Being an expert on ancient Allag, for instance, means that certain catboys know how to operate computers/robotic nodes.
For the Sixth Astral Era at least we can say that the vast majority was lost and only recently was what’s left rediscovered. After the Calamity of Water the few wise men and libraries left were destroyed, and the few surviving sources of knowledge (like Azys La or Void Ark) were out of reach.