Crimson Mage (Empire of the Lotus, Book 1) by Dorothy Dreyer
Upon the one hundredth reincarnation of the Lotus empress, the dark god Kashmeru would send out his shadow army—Pishacha—to destroy the reborn empress, which in turn would bring about the collapse of the universe.
The world changed at the time of the Eradication. The New Asian Administration outlawed mages, forbidding any use of their powers. To protect her imprisoned family, Mayhara Guatama made a deal to surrender her mage status and pledge her life to the New Order.
Years have passed, the chaos from the upheaval long since settled. Or so Mayhara believed… until she receives a mysterious message pleading for her help.
Stunned by the claim that the empress has been reincarnated, Mayhara must choose between fealty to the Lotus empire, or honoring the decree that assured her family’s safety.