Species
Humanity, its descendants, and life beyond Earth.
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Copious balloon creatures
Brown balloonlike creatures appeared above Copious' sea during the experience shared by Serilda and Eastcott. Each floated with eight tethers reaching down toward green areas in the ocean.
Cylli's wildlife
Cylli preserved diverse plant and animal life inside her habitat over millennia. The animals around the settlers had not learned to fear Humans.
Flaxens
The Flaxens are the people of Venus who claim a separate and superior identity to humans. Their state wages a campaign of conquest on Earth.
Humans
Humans are the people descended from Earth whose civilization spreads to Mars and Venus. The Flaxens claim to have surpassed them and deny their own humanity.
Human–Flaxen hybrids
Human–Flaxen hybrids are people with both human and Flaxen parentage. Some possess unusual mental abilities that contemporary United Earth uses in intelligence work.
Titan organism
The Titan organism is a simple prion-like life-form recovered from a lake on Saturn's moon Titan. Its adaptation to warm human environments triggers a catastrophic pandemic.
Unnamed peaceful civilization
An unnamed civilization was seen in Serilda's encounter with the horde's collective mind. It had lived peacefully for eons before a prolonged war with the horde.