Stones of Power (The Omnibus Edition) - David Gemmell

Rebellion and invasion plunge Britannia into the Dark Ages. Chaos and terror stalk the land, the King slain by traitors, the great Sword of Power vanished beyond the Circle of Mist. Saxons, Angles, Jutes and Brigante tribesman mass together to destroy the realm, aided by the powers of the Witch Queen and the Lord of the Undead. Against them stands a weakling boy, and an old mountain warrior. But the boy has the blood of kings, and the warrior is Culain, the legendary Lord of the Lance. And he alone knows the dreaded secret of the Witch Queen.