People have suggested making the Path of the Governor buff city defense in various ways. One way would be to give heroes with the path "spells" or abilities themed on medieval fortifications that they call for. These would make governor heroes much more interesting to play since they could actually do something.
Boiling oil - AOE spell doing flame damage
Hail of stones - drop rocks on attackers heads, i think earth elementals have something that could be duplicated for this. has a chance to knock down enemies.
hail of arrows - exactly what it says.
fortify - stolen from the krax ability (some might not want anyone other than krax to have this, which I could understand. I'm just throwing it out there).
stakes - not sure if there is an existing ability/spell to make enemies take damage when they step on a tile. could be used for makeshift "walls".
summon reinforcements - defenders got killed? call in some more.
These might not have to cost mana if a cooldown could be used since these technically wouldn't be "magic" from a lore perspective, but they would need some limitation to maintain balance.
