The Elf Witch by Jacquelyn Gilmore (Plot of the Six Saint, 1 of 3)

After her grandmother’s execution, a formerly magicless elf is suddenly the most powerful witch in her village. Magic is disappearing, though, and Imani is thrust into the treacherous court of her kingdom, forced into trials against the most lethal witches in the world. As she unravels the perilous plan her grandmother plotted before her death to save magic, Imani unwittingly dives deeper into a web of magical and political intrigue, which puts her on a collision course with dangers beyond anything she imagined. But Imani is harboring illicit knowledge of her own-a forbidden dark magic that’s getting more difficult to hide by the day. Now, she must decide whether to make herself a threat and an enemy to her country or risk becoming a pawn and the realm losing magic forever. Stuck in this predicament, Imani sees only one path forward: a dangerous deal with the duplicitous prince-one she might be falling for.