>Lifeless planet is potentially habitable.
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>Supermassive population of sapient female humanoids suddenly arrives all at once.
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>They had to turn to cannibalism and vampirism to survive because there is initially no other accessible sources of food or water.
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>They acquired access to technology that allows them to be impregnated by themselves, by another woman, or by multiple other women, but only daughters can be conceived by this process.
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>They'd have a long history of warfare, and those who were defeated would become a source of sustenance and reproduction for the victors. Even after peace was established the countries would hold deathgame-like wars for these purposes, warlike cultures formed and became prevalent.
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>Under heavy pressures from natural selection the traits benefitting lesbianism and obligate cannibalism/vampirism are favored and exaggerated, over successive generations they evolve into a separate species from those who'd first arrived on the planet.
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>Over time they terraform the planet just with their presence in such overwhelming numbers, carrying new elements and organisms within their bodies that completely change the planetary environment and atmosphere, other life soon emerges from the changed conditions, developing into multicellular species and forming new ecosystems.
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>Over a couple million years later, the space dykes would have new animals and plants to consume, but they would never fully give up their practices of intraspecies predation, be it due to the cultures they developed or their biology, similarly, many species arose with both male and female species, but the colonists were so fargone into being exclusively composed of lesbians that reproduced by technology that none would have genuine sexual interest in a male of any variety except for the few fetishists at the extreme ends of sexual openness (they would have to be zoophiles as well).
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>They develop encounter two new species with ties to their pasts: First, an all-male species with a shared origin story - forgotten spaceships of prisoners held in stasis, the product of a tyrannical galactic empire that had died out long ago, they had no staff for they were entirely autonomous and run by AI-directed robotics. Naturally, these two species no longer resembled each other, but both were warlike and technologically advanced enough to become rivals whose feud would burn their regions of the galaxy.
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