Bloc Politics
Ultra rare0.3%ObjectiveOptionalSingle-player
Have max cohesion in your Bloc
Needs All Under Heaven - Blocs are a Japan mechanic. Cohesion climbs easily to about 75 and then crawls, so the wiki's answer is violence: as a Sōryō governor, use the Bloc Expansion CB repeatedly - each victory banks +5 Cohesion - and chain wars until the meter reads 100. Fits the same Japan campaign as 
