At winter's end

Seven thousand centuries ago, falling death stars unleashed fiery apocalyptic destruction on Earth and inaugurated the Long Winter. One small band of People took refuge in an underground cocoon where they and their descendants waited for the time of ice to end. Now their long winter is over. Prophecy and circumstance urge the tribe out into the half-forgotten world beyond their safe cocoon. Led by their chieftain Koshmar, the tribe journeys to the city of Vengiboneeza, where the prophecy of the gods says they are to rule. On their way the tribe discovers the dangers and wonders of life in the New Springtime. In the face of new temptations and peril, Koshmar and her lover, the priestess Torlyri, struggle to keep the People united and fulfill the prophecy. For soon they will be beset by other trials, as other beings seek to fulfill their own prophecies.

from goodreads