Elemental Forums
So when there is a city with 3/3/1 right next to a tile that has 3/3 and is closer to being within 'REX' there is no reason not to build a city on the essence tile, but the computer apparently believes there is.
I do not believe the computer is aware that essence even exists currently, and their build locations needs to be addressed.
I can confirm that the AI is not choosing things based on Essence as far as observation can determine.
The problem is... When you have a city ontop of a place of great essence, there start appearing small "Essence" factories, which captures essence in small capsules, and sells it on the black market, this essence screws over the user, but gives a highly prized euphoric rush, just like most drugs, but with magic!.
So to avoid unnecessary addicts, essence related deaths and a general rise in unrest, the AI knows to avoid it!.
ok I am joking 
, good find!
Sincerely
~ Kongdej
I don't think many changes to the AI are happening until the main game mechanics are in place, Brad has said in another post. I would expect new mechanics of essence and city promotion to be far from optimal.
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