What I would think would be cool is more hero skills that open up unit tactical options.
For instance, warrior skill line that has skills that give all units categorized as archers a 'volley' skill, or all units with swords some bleed skill.
Mage skill line could have stuff to grant magic units extra abilities as well.
I think there's a lot more that can be done with the hero's advancement and how it effects things on the battlefield.
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