A picture worths thousands word, what can this picture tell us?

Just try to get some groupthink here. Looking from Kitkun’s picture here, I believe I understand a few things:
1. Green area (probably made by spending essence) is the only productive area that gives out resources.
2. City has a (red) border)
3. 10 ESS probably means that the amount of Essence the Soverigen can spend is finite, depend on his level
4. There is both spell research (scorching touch) and tech research (weaponry)
5. Looking at the left top corner, the sovereign displayed here is at level 1, has spell casting ability of level 1 (& mana level represented by the blue bar). He does not seem to have magical resistance.
6. When you build a new building for a city, the city perimeter (city wall) just expand with it.
7. Hills are not traversable, so walking only unit has a lot of choke point.
What is that sun like halo?
There must be something else you can derive from this picture. Thanks Kitkun!
