Dragons Of A Fallen Sun by Margaret Weis

In a world left shaken by the gods' absence, a charismatic and mysterious young woman named Mina rises to lead a fervent religious movement that upends nations and draws ancient dragons and old heroes back into a war-torn Krynn; as kingdoms fracture and hidden powers maneuver, survivors and returning champions must confront questions of faith, loyalty, and destiny while the balance between mortals and long-dormant forces is violently reshaped.

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