Books in Age of Asango series

Four and a half years after the events of book one, Cassian is called to serve in the Denigoth military and must contend with the corrupt forces that wish to see him dead, as well as with his starborn brother, Dimitris. Gretis has honed Kota into an incredibly skilled warrior, but she remains terrified of the awesome power the sleeps within him as the time looms nearer and nearer when she must draw it out. Livia and Iona must begin to face the consequences of who and what each of them truly is.

It is an age of slavery, of magic, wonder, and racism...The greatest threat to the order of the Denigoth Empire is a sixteen-year-old genius named Cassian Asango. Five years before, his parents were put to death for thought crimes. In the years since, Cassian has honed his tremendous talent for sorcery and dared to follow in his parents’ footsteps, speaking defiantly against the evils in his society. Many factions seek to kill him, but he is clever, resourceful, and far more dangerous than anyone anticipates.