So, what else could be added! ...
When playing Cossacks, I liked the idea of hiring neutral troops to attack the enemy... something similar could be implemented through a tavern on the map... for example, for 2000 gold, a spy is sent - it reveals all enemy heroes outside the map and their strongest unit... + for an additional fee, a sabotage squad can be sent to them... :) weekly, a list of available mercenary squads is displayed... after hiring, after all the computer heroes have taken their turns, the computer attacks the specified hero with the hired army...
That's all I can think of.