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

:D I meant that they wanted to make Kabirs, but there isn't a similar model in Heroes 5. I understand, we either keep the Fire Elementals or come up with something new.

You can use the Fire Elementals as a base, and create the hands, torso, and head from the Black Dragon, and the legs from the same dragon. Recolor it, and it should look good.