Books in the The Merlin Spiral series

A strange meteorite. A deadly enchantment. And only Merlin can destroy it. A meteorite brings a mysterious black stone whose sinister power ensnares everyone except Merlin, the blind son of a swordsmith. Soon, all of Britain will be under its power, and he must destroy the stone---or die trying.

Britain is at war on three fronts, and Merlin must guide the young Arthur as the teenager takes the mantle of high king. At the same time Merlin must confront his greatest fear in the form of a new evil that has arisen on the island---an army of werewolves that are ravaging the land. Can he defeat them before it's too late?