From the introduction:
Perhaps in some far-flung dream of glory, there was once a world in which the greatest champions were chosen by the fickle, yet eternal blessings of the celestial forces above them. Perhaps they were defined by a great struggle against worldmaking titans, whose dying curses doomed them to hubris.
This is not that world. Though suffused with divine life energy and wills of their own, the sun and earth are distant and inscrutable celestial bodies, not deities.