Mykan
Oh Wise One
My prep for 16 is getting BTG, ETC, Vortex and Simia all to lvl 16, then start in on the tech tree. Yes, I'm primarily a fighting city, but don't find the slog through chapters fun at all.
So, adding the Vortex (for the increased Sentient production, not the portal storage boost) is just part of that 'every little bit helps' outlook. At some point, it could also help conserve seeds for Sentient production if I can get by with fewer factories. Since I'm not there yet, I don't know that for sure.
If your only looking at vortex for sentient and your city has a combat focus, have you considered Pyramid of Purification? With enough armories it will produce a significant amount of sentient goods and potentially save on seeds (if you drop some factories due to increased production). I found as I levelled mine I could drop the second sentient factory, stop MM spells. Dropping the extra factories saved me a huge amount of seeds, it is what helped me get through ch17 as the switching between seeds and unurium was killing me. Saving in seeds let me focus more on unurium due to less need for seeds.
I am at the point now I could teleport all my sentient factories out (have a S2 & S3 floating around, for quests or laziness). Around a similar time I dropped my vortex as it just was not providing anything useful. Ch 20 is the first time I am wondering if it may yet be beneficial due to how the chapter is structured (see free-spirit's comment above). I have an exceptional amount of PP instants and untapped PP buildings so I don't foresee an issue with it for me in this chapter. Who knows if they make this more of a standard approach though...
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