The Prydain Chronicles Book Five: The High King

The Sword of Dyrnwyn, the most powerful weapon in the kingdom of Prydain, has fallen into the hands of Arawn-Death-Lord. Now Taran, Assistant Pig-Keeper, and Price Gwydion lead an army against the powerful lord. After a winter expedition filled with danger, Taran's forces arrive at Mount Dragon, evil's stronghold. There Tara is forced to make the most crucial decisions of his life as he confronts the evil enchantress Achren and the diabolical Arawn.