Soria is the leader of the Sorians, a race of people who lived on
Earth a long time ago. At this time the ancient gods of Olympus
also lived on the Earth and enslaved Soria's people. The gods
left Earth when a flood was imminent, leaving Soria and her people
behind, guarded by the Keconopters. The Sorians built themselves
an ark in which they lived until the floods subsided.
After the first flood the Sorians emerged, only to be attacked by
the Keconopters. In desperation they built underground cities,
hibernating in them after their supplies ran out, in the hope
that the second flood would destroy the Keconopters.
In Before the Flood, Ulysses stumbles across this parallel Earth
just before the planet's polar axis is due to change, triggering the flood.
Ulysses revives Soria and together they set about rescuing the Sorians
from both the flood and the Keconopters.