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

Okay.

So, I understand that basilisks will be Polish?
In general, it would be possible to make Tyrannosaurus mounts for the Lizardmen (on level 7), but give them a different name. And for level 1, Gnolls.


Added 3 minutes ago
And, of course, where would we be without mages?! Priests are definitely needed! (It would be possible to try it on liches.)

Polish basilisks are not yet available, but they can be added later.
Tyrannosaurus mounts should be made either for the Lizard Rider or the Warlock; otherwise, they will either be too small or lack animations.
Gnolls can also be used for level 1, but then it would be better to give them a different model, because the Orcish Warrior is very large.
I would make a priest for the Shaman or someone else; it is unlikely that we will be able to make it as good as the Poles did for the Lich, although it can be made for anyone.
It is also possible to make a lizard based on the Hellhound; I have had this idea for a long time