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

In the Sanctuary, turtles will replace the Murmillo, sea elves will replace the river spirits, the entire Altgreim will be reworked with a winter, icy theme, and units will have various special effects to hide the awkwardness of some animations.

I completely agree about the Murmillo; they are quite lackluster.
I saw that in Heroes of Might and Magic 5.5, the images of some runes were changed. Would it be possible to rename them? The image can also be changed, but then, as I understand it, there will be a problem with the rune's animation.

Regarding the frost Kirin: I saw that in WGE, there was an ability called "Northern Breath"; would it be possible to include it?

The priestesses could be given regeneration, like in Heroes 6, and the Altgreim could be given cold magic.

As I understand it, the Sanctuary will be similar to the elves (strong archers at levels 3-4, fast creatures).

What do you think about the idea of Kensei as a hero-general?