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From Warhammer 40k - Lexicanum
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→Ecology
After the majority of the planet's population was annihilated by the [[psychneuein]], the world became unsafe for life beyond the confines of the psychically-protected Tizca. Thus, the world outside Tizca's walls became known as '''The Desolation of Prospero.'''{{Fn|2a}}{{Fn|2e}} Tizca's natural environment was warm, nestled amongst mountains and an ocean bay, and featured a river running through Old Tizca, suggesting a Mediterranean climate. Techno-psychic arrays built into the mountains of Tizca were used to reliably predict and control the weather's climate.{{Fn|2f}} Beneath Tizca's ventral mountain ranges, the psychics of Tizca built massive hydroponic gardens.{{Fn|2d}}
The psychneuein, an indigenous species on Prospero, was a major threat to the early settlers of Prospero. The [[Thousand Sons]] theorized that, thousands of years ago, a warp-event triggered an explosion of uncontrolled psychic potential within Prospero's population, which in turn drove the pscyheneuein into a feeding frenzy, ultimately destroying almost all sentient life on Prospero. The only survivors fled to, and fortified, Tizcawhat was then-called “The Tizcan commune, ” the last outpost of the planet's civilization. Tizca and its citizens continued to thrive, thanks to their ability to harness [[telekinesis]] shields that kept the psychneuein at bay.{{Fn|2d}} The psychneuein continued to present a problem to inhabitants of the world that would venture beyond the protective wards of Tizca all the way up to the end, when the planet's entire ecosystem was destroyed by planetary bombardment.{{Fn|2e}}{{Fn|2c}}
The psychneuein reproduced by implanting eggs into a host's brain psychically. An infected host would have no idea they'd been implanted until the eggs began to grow, causing severe pain and ultimately, death as the eggs hatched. On only one known occasion has a victim been successfully cured of the implanted psychic eggs. An archaeologist, living in Tizca, had been implanted while outside the city on a day trip. She later collapsed and was taken to a hospital where a team of highly skilled Thousand Sons Astartes were able to use their powers to remove the eggs from her brain in a form of psychic surgery.{{Fn|2}}
