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Slave Race: Actually, mostly averted (with the provisos mentioned under Slave Mooks) – since We Will Use Manual Labor in the Future is averted, apart from war (again, see Slave Mooks, and preferably with tactical enslavement) about the only practical use of biological slaves is “pleasure slaves” (for which, obviously, one’
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Slave Mooks: There are some species and polities that like to keep these around (often AIs or other disfavored “not-people” in the eyes of galactic bigots, although that tends to come with special risks; see Robot War), and some people – well, for ultimate values of complete bastards, people – do this
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Shock Collar: Unsurprisingly used (because in a universe with extensive automation possibilities and, moreover, the ability to use perverted sophotechnology to edit people into compliance, the only reason to go for conventional slavery is sadism For The Evulz) by the absolute worst of the Galaxy’s slaver civilizations and subcultures;
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Robots Enslaving Robots: Rare, but not unknown, especially when the AI code used to build them is based off insufficiently processed sophont brainscans. Without the same careful design effort that goes into transsophonts being put into making them so, artificial minds are no more immune from irrationality, hypocrisy, and unenlightened
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Rape Is A Special Kind of Evil: Not quite played straight; possibly because it’s significantly less common, the eldrae (for example) lacking that peculiar messiness in the human brain where lust and power-lust get tangled up together into a peculiarly vicious kind of squick. It’s slaving, rather, that