[Astromancer]

This world's equivalents of London and Winchester are in Grey Areas, which is seen as good for political stability.

Both Grey Art and Emerald Art are used to aid agriculture. Crop yields are almost always optimal and then some. Many plants have been acclimatized to this area by magic that either weren't grown in this area until far later or never at all. Given the disruptions of life in the Color Manna areas (mainly larger numbers of magical beasts and events) Grey Areas are both more urban than early TL5 normally are and have more agriculture too.

Color magic areas are always more rural than they would be otherwise.