Conquerors Moon by Julian May (Boreal Moon: Book 1)

To forge a kingdom takes a will of iron�

Prince Conrig of Cathra has a vision: to unite all four provinces of the island of High Blenholme under Cathrane sovereignty. One of the provinces is stubbornly refusing to bend to his will, but Conrig has a new secret weapon. He has formed an alliance Ullanoth, princess of the remote northern province of Moss and a fearsome sorceress.

Meanwhile, Ullanoth is tending to her own schemes. Possessing the talent to call on the unearthly powers of the Beaconfolk, mysterious otherworldly beings who appear as lights in the sky, her power is undeniable. But the Lights are fickle, and their interference in human affairs unpredictable. If Ullanoth calls on them to help Conrig, they may extract a perilous price�

A powerful new fantasy adventure filled with dark magic and deadly intrigue from the celebrated author of the Saga of the Pliocene Exile.

7/10 A powerful new fantasy adventure filled with dark magic and deadly intrigue.