NTBF – New buildings for the towns in Tribes of the East 3.1.

I doubt that would work here.

Too bad. It was the best innovation in Heroes 4.

And should we get rid of alternate characters then?

No, not necessarily. Although it would require a lot of work. ------------------------------- And another question: is it possible to make the alternative upgrade the SECOND upgrade for a creature?

Added 1 minute ago
That is, add another building upgrade in the Castle and have militia upgrade to Landlords, etc.

Added 5 minutes ago

And suggest some kind of building?

A portal, like in Heroes 3 for Dungeon. Once a week, you can buy creatures from a random dwelling of yours (instantly). Each week, the dwelling changes. The point is that you don't have to wait for the hero to arrive with the creatures (at least partially).

Added 4 minutes ago

- Allows you to learn a random spell, according to the upgraded lords in the schools of magic.

Have you already tried to implement this? Is it even feasible? And how does it work? 1. One random spell is generated. 2. One random spell is generated for level 1 of the magic guild? 3. And is it possible to make it so that the player can choose their favorite school of magic (like in Heroes 7)?