Advance
Armed Envoys
Our army is feared far and wide. Despite our reputation, we should still establish diplomatic relations with nations that have the same goal as ourselves: the destruction of our common enemies. By sending well-armed and escorted envoys to foreign courts, we can ensure our diplomatic reach will not suffer under outbreaks of violence.
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
Diplomatic Range+25%