Wanted to cut and paste this snippet I posted in another thread but is also relevant here. I am just hyped about the idea of improving the elemental aspect of game play.
There is a lot of work to be done making synergy between the systems. This is what I have been thinking of most as a blanket improvement since I started playing. Defiantly expected more of this out of the box.
Examples....
1) Random quest x might need to have a princess released from an icy prison. Only suitable tactical fire spells will break the ice barrier. She rewards you with the water/air protection amulet that her captors gave her to stay alive in the icy cell. (Which means protection from element stats would have to be in the game. are they? I haven't seen it yet and I think that would be an automatic)
2) Random quest y village needs 10 swords of a specific type which you need to get from the military tree.
3) Kingdoms have ratings on how much they lean toward a specific element. Upped by things like using spells, getting nodes, doing element specific quests. High ratings earn abilities to learn element specific techs in research trees.
a)Instead of harvesting if you have earth affinity you can get "one with the fields" which gives a slightly higher bonus than harvesting.
b)An option might unlock in military to develop cold-steel weapons if you have air and water affinity. They might have combat speed improvement and a damage bonus against fire.
c)High fire affinity and an evil faction unlocks techs in the magic tree like "Lava Moats". You can build streams of lava on non mountain tiles around your city that make any enemies entering them take 5-10% HP damage.
d)water affinity could unlock research to give you access to notable locations your water transports can explore.
e)air affinity in the diplomatic tree unlocks "The Brotherhood of the Winds". Empires who enter the brotherhood together get increased goodwill, some air bonuses versus hostile kingdoms, negative impacts if they attack each other.
Note it doesn't need to increase the complexity for casual gamers just basically adding a ton of "whoa that is a neat touch" content unlocked as the users naturally do what they are doing already. Wish I had time to mod because this game seems like a great sandbox to play with. Game-play content/balance would be a great job to have on this game IMHO.