So, I'm in the Classical Era, & decide to purchase the Opener for the Patronage Tree (without checking the effects, I confess). Imagine my surprise when I was suddenly able to see about 2/3rds of the map...thanks to the "reveal all city states" ability. Sorry, guys, but that is just way, way too over-powered in my books...so much so that it has actually taken away my enjoyment of the current game. Is there any way to limit the reveal to City States in a certain area (same continent, within x hexes....that kind of thing?) Either way, it seriously needs changing. Might have to dump that game now I reckon, as all the mystery has gone out of it! Aussie.