The Citadel of Forgotten Myths by Michael Moorcock

The estranged ruler of the Melnibonéan empire, Elric is struggling with his nature and the constant thirst of his soul-sucking sword, Stormbringer. He wants his dying empire to thrive, but is he up to the task?

With his companion Moonglum, he hunts across his lands for the great Citadel of Forgotten Myths, seeking the answers to the nature of the Phroon, the dragon-like creatures of The Young Kingdom. Perhaps they can save his empire... 

Set between the first and second book in the Elric Saga, The Citadel of Forgotten Myths is perfect for longtime fans and those new to this epic fantasy series.