Interestingly, FP Necros growth is not THAT bad considering you have +3 from the growth curve. It might still be a pretty decent build even played "legit" as devs intended. Competing with Driven Assimilator will be hard, but you still invade primitive worlds for a bunch of pops immediately, which has the new side effect of getting you close to optimal S-curve growth on new planets. Another +20% growth can be fairly quickly obtained from tech and expansion ideas, bringing you another +1.2
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(please try to blot out the digusting clerks being employed, I assure you this is merely a test game and such a travesty would never happen in a real game)