Ivory key duology

Vira, Ronak, Kaleb, and Riya may be siblings, but they've never been close or even liked each other that much. Torn apart by the different paths their lives have taken, only one thing can bring them back together: the search for the Ivory Key, a thing of legend that will lead the way to a new source of magic. Magic is Ashoka's biggest export and the only thing standing between them and war with the neighboring kingdoms—as long as their enemies don't...