Lloyd Alexander: The High King

Used Paperback. Great for ages 9-12+. 

The story follows Taran, an Assistant Pig-Keeper who has grown into a brave young leader over the course of the series. When the powerful magical sword Dyrnwyn falls into the hands of the evil Arawn, Lord of the Land of Death, Taran, Prince Gwydion, and their friends must rally the people of Prydain for one final battle.