You can declare which god your city mainly follows, giving you different buffs.
Partake in a pilgrimage across the map and unlock a "Knight of the Nine" special hero character.
Build a guild hall, and choose to specialize in only one of them in your city, unlocking special units.
Each city has a special building or unit that makes it unique, but not overpowered.
I haven't worked on the map in years, and while it is very playable, I never really got to show it off to too many people. You can view the map and download it http://www.hiveworkshop.com/forums/maps-564/oblivion-aftermath-v-30-3-a-161540/?prev=search%3DOblivion%26d%3Dlist%26r%3D20
The game is meant to be played with a full house, I'm on USEast realm if anyone ever wants to play, my screenname is Urgan.
EDIT: http://img40.imageshack.us/img40/8739/newmapscreen.jpg is a picture of the map overview.