More uses for Iron
There is only so much that can be done with iron. My hordes are generally full and left uncollected. Research takes too long and that's really all it can be used for anymore. Please allow the use of iron for upgrading walls or have a way to convert it to gold/mithril/essence. The current wall cost is too much gold for 1 wall. I have been playing since the start and have yet to run out of defenses to upgrade with gold so the idea of keeping walls at gold cost to allow for something to work toward, doesn't really make sense.