Spell of the Witch World (Witch World Series 2: High Hallack Cycle)

Few authors have achieved such renown as World Fantasy Life Achievement honoree and Science Fiction Writers of America Grand Master Andre Norton. With the love of readers and the praise of critics, Norton’s books have sold millions of copies worldwide.
 
Their fates were bound by their mother’s white magic—though darkness and battle strove to drive them apart . . .

It was in the year of the Fire Troll that the sea-raiders struck at High Hallack and, promise-bound, its sons rose to the defense of their Dale. But there stood among their number a youth whom the Dalesmen had merely fostered: Elyn, born of Estcarp, whose birthright was the wisdom of the Wise. But Elyn of Estcarp was still young and, though a warrior impatient for battle, his unscarred sword had learnt little of the dark treacheries of war. In his most desperate hour of danger, Elyn’s stoutest weapon would prove his brave witch-sister Elys. Together, witch and warrior would face perils beyond the laws of our everyday stars!