nation 23

[Sombre]

You technically can make a list of spells for nation 23, but I doubt the indies in game would use it.

What you'd have to do is first remove all the vanilla spells from the game - easy but time consuming. Then you'd remake the entire library of spells for each nation, making one version of fire flies etc for each of them and restricting it to the appropriate nation number, perhaps even calling it N11 Fire Flies, N12 Fire Flies and so on.

When you come to nation 23 you only give them certain spells. Entirely possible. IMHO a waste of time and effort though, especially as it might not even work to restrict indy spell lists. They might be working off some other spell list entirely. When I've added non nation restricted spells to the game, I have never ever seen indies cast them.