Ideas to stop mass castle building for DOM_3

[Jack Simth]

Well, one of the best ways to stop one strategy is to make others equally viable - strengthening the more expensive castles would be one way to discourage Mad Castling. Personally, I like my idea of making them into moddable magic sites - it's even thematic, as it goes with the flavor text of how magic gems form - energy from the stars hits the planet and, in special places, is captured and converted. A designer, knowing of this phenomina, would be likely to take advantage of it, no? It might also allow you to implement the supply production of Fortified Cities that you suggest - the FC produces 50 supply (or whatever, as a Cauldron of Broth) every turn.