Unlocks the Builder ability to construct a Mission, unique to Spain.

+2 Faith. +2 Science after progressing 'Exploration' Civic. +1 Science for every adjacent Campus or Holy Site. In cities with a Mission adjacent to Holy Site, Citizens provide +0.2 Faith. In cities with a Mission adjacent to Campus, Citizens provide +0.2 Science. These bonuses for citizens are doubled if the city is not on your Capital's continent or is captured by you.

Once Buttress is unlocked it can also be built on Floodplains.

+1 Food from each adjacent Mbanza tile.
+1 Production from each adjacent Mbanza tile.
+1 Food from each adjacent Neighborhood tile.
+1 Production from each adjacent Neighborhood tile.
+1 Science from each adjacent Campus tile.
+1 Science from each adjacent Holy Site tile.