The Endless King (Knights of the Borrowed Dark Book 3)

Denizen Hardwick has travelled to Daybreak, the ancestral home of the Order of the Borrowed Dark, to continue his training as a knight. But lessons have barely begun before an unexpected arrival appears with news that throws the fortress into uproar. The Endless King has fallen, his dark realm rising in a brutal civil war. When the conflict strikes closer to home, Denizen and his friends face their greatest challenge yet. For if Daybreak falls, so does the world.