The Black Cauldron by Lloyd Alexander

In this fantasy novel, a young assistant pig-keeper named Taran embarks on a perilous quest with his companions to prevent the dark lord Arawn from using the powerful Black Cauldron to create an unstoppable army of undead warriors. As they journey through the mystical land of Prydain, Taran and his friends face numerous challenges and moral dilemmas, testing their courage, loyalty, and wisdom. The story explores themes of heroism, sacrifice, and the struggle between good and evil, as Taran learns valuable lessons about leadership and the true nature of power. The 5759th greatest book of all time