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My feeling here is that should not be in the research tree in the first place.In my second game I really felt constrained and there was about no way I'd find out were it should be. I had to look on the forum to find this. Funnily, I stopped my game to make remarks when actually researching for "formal diplomacy" in said game.I'd propose:- tie the quantity of buildable civic centers to the "upgradable" lander level.- tie diplomacy possibilities to linguistics.Linguistics also need more possibilities. Currently it's a "single" building which is easy to overlook. Linguistic points should flow instead of being another research path.What I'm proposing is that :- encountering other nations gives some points toward getting their language.- any action involving them (like spying) on them should give linguistic points- The "basic" growth of linguistic should be a number of point per turn as soon as you've discovered them (limited to getting to level 1)- getting to level 1 linguistics should allow diplomatic building (international trade posts, combined research centers, embassies, burlust bars...) and the higher level, the more diverse buildings there. Those would also give linguistic points (again, limited to a max level).- having a trade relation or setting a diplomacy trade should give linguistic points.Basically you're getting the idea of where I want to go with this. Then I'm wondering if it's worth it to remove the "linguistic" generic building.PS : about buildings, it good be good if high level buildings given like this could give a "specific" race bonus, like "allying" with high level boarine give new diplomacy options or bonii, "allying" with neinzul might give access to some of their unique unit mechanics (from what I've seen).