MagisterCultuum
Great Sage
Requiring either a Forge or at least the tech that allows forges seems reasonable, since it gives the free buildings. I wouldn't nerf it any more than that though.
I do however think that the City of a Thousand Slums does not belong at Engineering. The tech already has a very good wonder, and it makes no thematic sense. Good Engineering would have prevented slums from ever developing. I still think the most Logical Tech for the City of a Thousand Slums is Taxation. I'm guessing that taxes in a dark fantasy mod would not be progressive taxes but would (like ancient Roman taxes) be much harder on the poor than the rich. That would make them poorer, and force them to live in crowded slums.
I do however think that the City of a Thousand Slums does not belong at Engineering. The tech already has a very good wonder, and it makes no thematic sense. Good Engineering would have prevented slums from ever developing. I still think the most Logical Tech for the City of a Thousand Slums is Taxation. I'm guessing that taxes in a dark fantasy mod would not be progressive taxes but would (like ancient Roman taxes) be much harder on the poor than the rich. That would make them poorer, and force them to live in crowded slums.