The Kingdoms of Ruin, Volume 2 (The Kingdoms of Ruin #5-10)

Witches were long the shepherds of all mankind, but the scientific Redia Empire rose up to exterminate them, one by one. When they murdered his mentor, the Ice Witch Chloe, Adonis swore revenge on the entire human race. But now, ten years after the Witch Hunts, a revelation stays his hand. Some small number of witches have survived in hiding. They may even hold the key to Chloe's resurrection. Could a slim hope still remain?