The Ascended (Serie Aesymarean, 1)

Thais Morvaren has a secret: she hides her ability to forge weapons from starlight. When her powers are exposed, she and her twin brother are forced to participate in the deadly Trials of Ascension. Trapped in a competition she never wanted to enter, she transforms her fear into determination: to kill Olinthar, King of the Gods. But to overthrow a god, she must become one herself, even if it means losing everything—including her relationship with the dark prince, whose secrets rival her own.