Then maybe something like this:I like it, I'll take it into consideration. Would be super powerful though so would probably remove the +15% Defensiveness as well.
- -1 minimum attacker penalty, i.e. a fort in a farmland province would get the -1 from rampart, a fort in a province with hill terrain wouldn't get an additional penalty because it already has -1 (-> deals with your concern that it could be too powerful)
- +50% cannons needed to "artillery barrage" (but then please also introduce something to make it less desirable / more risky to run around with a full backrow of artillery) (-> deals with the realism argument that ramparts were built to protect a fort against artillery, so replacing the +15% defensiveness.) Or a more generic dlc-compatble -50% chance for "breach wall", whether that be from artillery barrage or from normal sieging.