AdvanceChanged this version
Merchant Adventures
This allows us to make use of the numerous traders lusting for fame and fortune, eager to offer their services for a chance to search and explore new trade routes.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
Modifiers
Definitionin_game/common/advances/4_choices_dip.txt:213
215icon = global_trade_routes_advance
216for = dip