I found something missing in Demigod. Adding more demigods to the mix of both the assassin and general types would add a miniscule amount of variety. Not really enough to make it worth an expansion purchase. What we need is another class of demigods.
The Architect Class
Yeah, that's what's missing. A class of demigods that can control the battlefield using buildings, instead of battle prowess or minion control. They would win a game by slowly pushing their border closer to your own, eventually owning the entire map. They could become a major defensive player in large team battles, the only one able to repair your defenses mid-game so that you can go the long haul.
You would be able to have at least 3 definitive types of Architect. First would be your builder, because the builder emphasizes everything that is the architect. Builders would have the ability to build new structures and place temporary structures, might also be able to give towers temporary boosts. Yes, I know the rook can place structures, but they're much weaker than a standard tower. I figure any OP of this class could be balanced by mechanics. Make a special space in the store (much like the general's place) where each tower (be it a light/dark tower or an archer tower) would be purchased and then go on the consumable items bar.
onto the second architect type, the Remodeler. Give it a special ability that takes a little more time to perform, but allows you to pull down your own tower and put it in the Remodeler's item bar... then they can put the tower up somewhere else! OMFG
The 3rd type, the Reinforcer. Able to heal defensive structures, temporarily boost the power of structures, even making them invulnerable for a short amount of time at high levels.
The 4th type, the Demolisher. Able to quickly destroy enemy defenses, but a weak combatant.
The architect class would likely always be lower-level in-game than the other demigods because they would spend a majority of their battles re-inforcing their defenses, and would rely more on their own structures and allies to help throw the battle in their favor. They would also be more gold-dependant than the other classes, as each structure might cost to build.
I would definitely spend the money on an expansion that incorporated more variety through a larger range of classes of demigods... and MORE MAPS!