The Ring of Eman Vath — Hal Emerson

The land of Aeon has been at peace for a hundred years, and towns and cities prosper. There is a new, just king in the city of Caelron, and the Sorev Ael of Var Athel keep the dangers of the Wilds at bay. But when an ancient artifact is found and brought through Dunlow, a fleet of ships with black sails invades in the dead of night, leaving hundreds dead. The land of Aeon is left reeling, and the lives of three young people are changed forever.