And then you add thrall worlds and it all comes together. Thanks.
I'm not entirely sold on thrall worlds as they stand tbh. I spammed the shit out of them in my slaver game at first (made pretty much every planet that was destined to be rural into one), and ended up sorely disappointed. Their only real benefit is the 50% growth bonus, but that is more or less countered by the inability to build robots factories or gene/cyto clinics there.
They also come with a whole slew of other downsides, including the inability to build the mineral or energy boost building (so there only real use is as agriworlds), the inabilty to build other useful buildings, and the inability to grow your primary species (maybe not a problem if your running slaver guilds, I'm not sure).
I could see them maybe being useful temporarily if you you don't go syncretic and have to acquire slaves later and want to speed up their growth so they can catch up with your empires need for workers, though the rather rather silly pop growth selection already does that for you.
Can anyone tell me how slaver guilds interacts with thrall worlds?
What about psionic ascension (telepaths to suppress crime, easy to keep spiritualists happy & make more spiritualists via temples) vs bio ascension (nerve stapling)?
Crime is pretty well irrelevant as it stands, at worst you might need 1 precinct on the largest of rural worlds to keep it down. The authoritarian and xenophobe factions are super easy to please, and they go hand in hand with slavery, so theres no reason to go psionic and spiritualist for faction pleasing reasons.
Bio ascension also goes hand in hand with xeno-slavery, and whilst nerve stapling still suffers from the lying political power problem, I believe they are treated as having 50% happiness so should result in higher planetary happiness and stability. I can't say for certain as the project to nerve-staple my slaves is still a few years from completion.
I don't like Slaver Guilds because it gets in the way of slave specialization, though if you aren't going for bio ascension & make a generalist species I suppose it could work.
It also gets in the way of planet specialisation, since rural worlds will end up with a lot of 'free' workers that are less productive and more costly than their enslaved counterparts, and city worlds will end up with a lot of surplus slaves. With xeno-slavery that can be fixed with resettlement or prevented with selective species growth, but afaik slaver guilds locks you into that 40% ratio with no recourse.