Town battles
One thing that I think is currently greatly lacking from the game, is strategically defendable positions when an enemy attacks one of your towns - or vice versa. Currently, you would hardly know that you were attacking/defending a town or city. If a town has a wall, I would like to see this represented in TBs. Defending units that are behind cover should receive a defensive bonus against spell/arrow attack. For example, if a large force were beseiging my lightly defended town, I might place archers in cover at the gates, to pick off the advancing enemy. I might place a mage on a hill, from where he could unleash his spells over the walls, or position my cavalry such that they could charge (and receive an attacking bonus for doing so) as they saw the whites of the enemies' eyes swarm towards the defences. I think that this would improve the strategic level of TBs no end, and also allow for seige engines to play a more crucial and specific role in battles. There could be new spells, increasing the defensive values of walls, or those that reduce or even destroy them. An epic game like Elemental very much needs something like this, I think...