The Gods Below (The Hollow Covenant #1) | by Andrea Stewart
About Book : The series is set in a world ravaged by ancient magic, where precious gemstones bestow magical abilities on the few individuals able to harness their power. Full of clandestine power struggles and the battles between gods, the story follows Hakara, a young woman searching for her missing sister and who will do anything to find her — even lead a rebellion against the gods themselves.