Changes Japan's trait to "Chained Country": units fight as though they were at full strength even when damaged; rival missionaries and prophets are killed with a 50% chance when on Japan's territory and Open Borders agreement was not signed with their owner. Replaces Zero unique unit with Dojo unique building.
Sakoku ("chained country") was the foreign relations policy of Japan under which no foreigner could enter nor could any Japanese leave the country on penalty of death. The policy was enacted by the Tokugawa shogunate under Tokugawa Iemitsu through a number of edicts and policies from 1633–39 and remained in effect until 1853 with the arrival of the Black Ships of Commodore Matthew Perry and the forcible opening of Japan to Western trade. It was still illegal to leave Japan until the Meiji Restoration (1868).
Dojo unique building replaces Amphitheater. It produces 3 culture and also gives 20 experience points to melee combat units trained in this city. Contains 1 slot for a Great Work of Writing.
A dojo is a training place for any of the Japanese 'do' arts which include poetry, calligraphy, theatre and other, but typically it is considered the formal gathering place for students of any Japanese martial arts style. Training in combat techniques incorporated the way of the arts (Geido), practice in the arts themselves, and instilling aesthetic concepts and the philosophy of arts. This led to combat techniques becoming known as the martial arts.