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

then I'll divide the standard heroes into regular and companion heroes, and the Dwarves will have 8 heroes with different specialties, instead of 16.

Wow! 8 heroes for the campaigns 0_o

Added 5 minutes later
By the way, the Sun Spirits and Stream Spirits use the fairy model, so I suggest replacing the spirit with a sea elf archer.