Re: How do you upgrade fortresses?
You don't. Not possible. Each nation has a set of forts defined for it, meaning that if you build in terrain A, you will get fort B. Terrain C, fort D and so on.
The only way to get different forts is by casting either Wizard's Tower, Three Red Seconds or one of the other spells that construct a fort (of a specific type).
Edi
|