The Foundation series
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In the Foundation series,
the immortals begin to intervene in mortal human affairs, ushering in a bright utopian future, until the whole thing comes crashing down upon Disastrous first contact with alien life.
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In Shadow of the Foundation,
the secretive Foundation begins to intervene more actively in the affairs of human civilization, covertly averting multiple existential crises while subtly ushering in a bright utopian future.
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In Part 1,
the accidental discovery of the "food of the gods" starts a civil war in Xiania, and attempts to resolve that situation seem to only make it worse.
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In Part 2,
the discovery of Kron's body buried in the Andes accidentally sets off a "zombie apocalypse", which Kron rides out while the rest of the world begins to panic.
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In Part 3,
the immortals embrace their role as hidden guides of the burgeoning global civilization, and subtly influence the emergence of a social and technological utopia.
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In Veil of the Foundation,
an expedition called the Einherjar, working for the Foundation, are sent the long way around to explore what lies on the other end of the sealed-off wormhole from Sol.
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In Part 1,
the Einherjar live in a virtual world while in suspended animation en route to their destination, and have to keep one member from getting off-mission therein.
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In Part 2,
the Einherjar arrive at their destination, get shot down to the one inhabitable planet in that star system, and meet the unusual variety of local species there.
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In Part 3,
the Einherjar discover a way off the alien planet and back to Sol, and learn the surprising connection between the histories of this world and of humanity.
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In Light of the Foundation,
humanity rallies behind the Foundation against the aliens who lie beyond the wormhole, only to be drawn into an already-ongoing galactic war, leading to the destruction of Earth.
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In Part 1,
Metis is reincarnated at the height of human civilization and slowly rediscovers her past just in time to to help humanity defend against an alien invasion.
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In Part 2,
the collective forces of humanity unite under the immortals to fight the alien invaders, until the Einherjar return to Sol and clear up a serious misunderstanding.
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In Part 3,
humanity and the Ehrban make tenuous peace, then their real common enemy attacks, leading to the destruction of Earth and the apparent deaths of Metis and Xio.