AdvanceChanged this version
Watchers of the Silk Road
We do not build, we do not trade. We take what we need... and sometimes more. Our warriors have kept an attentive watch upon foreign merchants and their passage, and we now know the safest paths for transporting our goods.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Reformation tree itself.
