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

By the way, I forgot to ask that when you're working on the mod for the Naga city, please remove the bug that causes the icons of creatures and buildings to blur when the image quality is set below high.

This is related to how these icons were saved; they were saved in the same way as creature textures, with Mip Maps being generated. Simply saving these icons without generating Mip Maps will fix the issue.

Added 3 minutes later
I've decided to finish the elementals. I'm currently working on a puzzle map and a demon summoning spell. The Hell Tower (the old elemental fusion) will now be a fortress – under guard and belonging to the player who captures it.