The Seven Songs of Merlin
Book 2 of The Lost Years of Merlin

To save his ailing mother, young Merlin must master the Seven Songs of Wisdom passed down from his grandfather, a legendary wizard. Only then can he journey to the spiritual Otherworld to obtain the elixir he needs. But the quest involves a task Merlin must perform - defeating a vile ogre whose merest glance means death. And even more difficult for the young wizard, he must discover the secret of seeing - not with his eyes but with his heart.