War servers aren't hard to make; the only problem is, people don't know how to make it right.
If I'm not mistaken, Umby is just simply a war in a customized Edron map. Kills are used as currency to create an account. That's it.
Maybe a couple formula modifications here and there.
I'm working on a war server myself that will be very different from the style of Umby, but my goal is to make it the best war server ever made.
It's still in its infancy, putting all my skills to work, I should have no problem making it extremely unique.