Contender

Manipulation > Coerce: +3% chance of successful manipulation (this action)
Assassination > Single Combat: +3% chance of positive outcome (this action)
-2% upkeep for all land units (parent army)
Bread and Games Edict:
+2 public order (local provincial edicts)

Manipulation > Coerce: +6% chance of successful manipulation (this action)
Assassination > Single Combat: +6% chance of positive outcome (this action)
-2% upkeep for all land units (parent army)
Bread and Games Edict:
+4 public order (local provincial edicts)

Manipulation > Coerce: +9% chance of successful manipulation (this action)
Assassination > Single Combat: +9% chance of positive outcome (this action)
-2% upkeep for all land units (parent army)
Bread and Games Edict:
+6 public order (local provincial edicts)