A DIPLOMAT can ESTABLISH an EMBASSY, INVESTIGATE a city, STEAL an ADVANCE, SABOTAGE production, INCITE a revolt or BRIBE a unit.
Most of these consume the diplomat.
Requires WRITING.
Inciting a city costs gold that rises with the owner's treasury and falls with distance from their capital. A city in DISORDER costs half. A CAPITAL cannot be bought at any price.
A diplomat in a city may block an enemy's attempt.