xienwolf
Deity
Well, not sure what you would do to Cardith Lorda in this case, but a possible approach is in his base mechanic.
Limit ALL civilizations to a certain number of cities until they reach a required tech (or age/tier whatever). Probably also limit how many settlements they can make, or just don't allow settlements at all except for Cardith once he is able to exceed his otherwise normal limit of cities. (of course at top tier you would want to have no limit on number of cities for normal civilizations, and probably an exponential growth rate if you limited by tier. If limited by tech spread the increased limits all over the tree so that almost every 2nd tech allows another city, thus keeping it from forcing a certain development route, like the engineering path, for civs who normally don't touch it).
Limit ALL civilizations to a certain number of cities until they reach a required tech (or age/tier whatever). Probably also limit how many settlements they can make, or just don't allow settlements at all except for Cardith once he is able to exceed his otherwise normal limit of cities. (of course at top tier you would want to have no limit on number of cities for normal civilizations, and probably an exponential growth rate if you limited by tier. If limited by tech spread the increased limits all over the tree so that almost every 2nd tech allows another city, thus keeping it from forcing a certain development route, like the engineering path, for civs who normally don't touch it).