From the introduction:
There is a sea called Endless, and within its depths a shining jewel floats... Uma. A lush orb, spiked with mountains, furred with forest, and flanked by deserts of ice and sand.
The age of myths bore the arrival of the Primes, some say from beyond the infinite gate whence the daemons come, others that they were the offspring of the Gods and the living earth.
Whatever the truth, they were the first men and enjoyed the bounty of immemorial paradise uncontested for an age.