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A couple of ideas:
Disinformation - neutral troops and, if possible, the enemy incorrectly see the hero's army. Neutral creatures, if released, pay the hero a ransom that is greater the larger the detachment was.
Spy network - the hero's attack and/or defense skills increase the more assassins/scouts/stalkers he has in his army.
Saboteur - when a hero captures a mine, he sets a trap there. The next hero who tries to take this mine will lose part of his army. The higher the level, the greater the losses.
Disinformation - I LIKE IT! :smile12:
Spy network - SPY... I think it's cool! :rolleyes: