RTF is a global modification that replaces all towns in the game.

don't use too many polygons, otherwise the game will crash; I don't know the maximum number, but I know that crashes can occur.

Added 3 minutes later

look, I saw it in the pictures, for example, there are bowls next to the throne, in which fire is burning - can this be implemented with effects in Heroes 5?

and secondly, you say that you can take a dwarf from somewhere? so that you don't have to create it from scratch?

P.S. can you add an anvil next to the throne, and is a book on a stand needed - like with rune magic?

fire can be added with effects

you can take a dwarf from the seventh game, but I think even a fifth-game rune priest will look great

I think you can have a book without an anvil, because it won't be clear that the anvil is needed for spellcasting if he doesn't use it.