Update Buildings: I like multiple use buildings: Lets improve on some of the less commonly used ones, and improve diversity.
New Mills:
Decrease Building Costs by % * 4 (Max of 99%)
Improves Food and rune production by %*2 (New)
20% New Mills @100%BE= -80% Building Costs, and +32% Food and rune production
New Guard Stations
Decrease Resource Losses when Attacked by % * 2
Increase enemy troop losses by % * 1.5 (New) (perhaps %*1 weaker)
IE:20% New Guard Stations @100BE= -32% losses when attacked, and +24% enemy troop losses.