Playing as Epeiros, I managed to take over all Dacia, and decided to try to build a Laarchia in Histrie, but I noticed the building doesn't appear there, even in the browser. Intrigued, I decided to take a look at the files, namely, export_descr_buildings.txt to see the requirements for Laarchia, and descr_strat.txt to see what Histrie has. It all seems to check out, leaving only one option open: hidden resources.

Laarchia hidden resources requirements are:

Code:
hidden_resource eastern or hidden_resource anatolian or hidden_resource illyria or hidden_resource italy or hidden_resource thrakia or hidden_resource liburnes or hidden_resource hyparchia or hidden_resource ioudaioi
And I couldn't find anything of that in the descr_strat.txt. So which file do I need to check?