I just read through the city hub file and realized we can have unique items unlocked by a specific type of settelment. So I am thinking I will make a merchant that sells special weapons and armor. The tile will look like a small fortified town. The prices will be high. It will be an alternate option to researching the warfare tree if you are like me and prefer to just go for heroes and civics. The catch is that the town will be very hard to capture, but your enemy can take it or you can for the sole purpose of a gold cache. The town will not be able to grow and I think I can make it get razed on capture. At the very least it presents yet another option for getting unique items and magics. I think a wizard tower with special golem amulets and other creature summonings would be very cool.
Want an Ice Demon by your side? You need only 1500 gildar to take it home today!