AI ususally queue all its resoruces it has, nearby their capital you should be able to find some deposits of iron/crystal - they get it for free once settled.
build missionary hall. search for quests.
Dragon cave is your winner, but, you'll need ton of influence if I remember correctly.
Demonshrill will help you a lot and are far closer in tech tree to get. try to find ogre lairs, with king of the wastes technology you'll get level 9th ogres out of the bat and they are killers in such environment
You can flip the angels outpost by building city nearby and snaking toward the outpost and building zoc enhancing buildings. That will allow you to take over the outpost without decalring war.
All in all you'll be better off probably by signing non aggressions pacts and searching for quests with your sovereing. Two governor champions mean more experience for your sovereing which is good as well, once you hit treshold of 20th level you should be safe to win anyway.
be aware, that AI will field those maces pretty soon which will give you large stacks of high attack and close to zero defence to fight off. They can be quite easily dispatched by archers but AI will field them also. and they will have lots of HP. blizzard/tornado is your friend.