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

Something went wrong with the heroes; the Dark Elves have a mage hero, and the Conflux has a hero from the Demons faction, complete with the Demons' passive ability, which means it won't affect the gameplay in any way...

This is a special, scripted map. If you play on standard maps, everything will be fine. I'll probably release a special version of the mod soon where all this will be fixed, but I'll have to sacrifice some territories and the "castle's beauty" in return, but at least there won't be any weirdness with the heroes.