There are two main ways to develop affinities:

This means that affinities have far-reaching implications shaping what strategies are viable for your civilization. There are also unlock systems which allow perks and upgrades for many types of building, unit, satellites, etc., based on your level in the affinities. Consequently, affinities develop primarily as a result of other choices whose principal benefits are unrelated. Affinities are increased by technological advancement and side effects of quests, and making efficient use of the strategic resources which are present near your capital requires advancing in particular affinities Floatstone needs Purity to use effectively, Xenomass needs Harmony, and Firaxite needs Supremacy. Ideologies were primarily set by the social development of a civilization and were therefore chosen rather than developing as an emergent consequence of other choices. Affinities are much like Ideologies in Civilization V: Brave New World in terms of direct game effects, the way you develop them is substantially different.

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