rn I'm messing about with stone weapons, human cave civs, giant (the creature) dark fortresses, and a fortress civ of knockoff troglodytes I'm calling lemurians. The lemurians are spouse converters and experimenters, which has resulted in some interesting stuff so far, though its still all rather janky.
So as it's intended, the males are spouse converters who make wives out of human females kidnapped from other civs. They do indeed do this, but naturally born lemurian wives are also a thing for some reason. Perhaps I can fix this by messing with the caste population weights, but idk yet. The lemurians also make experiments out of eachother, resulting in things like Plumus, a Lemurian who's mother is an experiment. Not sure if I can (or want to) get them to only experiment on other races.
I was able to get them to semi-regularly make far more mountain halls than fortresses or hillocks by giving them 1000 biome support in mountains and 1 biome support elsewhere. They still make hillocks and fortresses, but if they are in a mountain range with more than one side on the map, they tend to spread throughout before spreading around.
Reading the legends entries of some of these guys is funny, as they seem to like traveling the world taking up apprenticeships under various people, frequently getting into fights with humans, then one day they kidnap a random woman, and return to their home to settle down.