The world map tessellates, so there are only 9 unique city+relic arrangements. While a particular type of relic sector may be one ring further way, all cities will have local access to all 9 types of relics in their first two rings.
There's a bit of distortion because their are twice as many relic sectors as city sectors. It's convenient to think of the rings as being diamond shaped (which may be all too true).
- Ring 0 is your city, which counts as one of the 9 local cities
- Ring 1 has unique 6 relics and 2 cities (East and West)
- Ring 2 has 10 relics, 3 unique and 7 duplicates
- Ring 2 has 6 cities (NE, East, SE, SW, West, NW)
- Each ring has 8 more sectors than the previous ring
- Every 3rd ring will have a lot of cities, because all 4 vertices will cover a city.
Relic boosts aren't randomly selected, rather they match the sectors that are to the north, southeast, and southwest of your city when you are initially placed on the world map. The implication, of course, is that there aren't any "rare" relics, so trading opportunities are based only on the development and discovery of your 200 nearest neighbors, and their activity levels.
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