While I remember. 1) When there's no tech for embassy, it says that the nation "does not have writing yet". Probably something in text files to fix. 2) For some reason when I moused over copper, it said that it requires "ancient lore" to use while nothing is mentioned in the tech. 3) Amn with their Shadow Thieves Guild could have a bit different Unique Power. Something along the line of Extra Spy at some tech which unlocks constebliaries.