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

The latest interesting ones. Like, cave orcs?

No, rather the opposite... the mountains are occupied by green orcs. Gray orcs are not a subspecies, but the result of certain magical rituals - they will have the ability "demon" (which in the mod is renamed to "spawn of darkness"), orcs will have, like the Haven faction, both dark and light magic, and Altgreed is a "dark" upgrade that is immune to unholy words. They appeared during the war with someone "good," for example, dwarves and mages might have decided that the orcs were taking too much gold and artifacts for passing through the underground trade route and it would be good to shut down this business....