A Sea of Troubles
Long dead wizard
Bowgentle is one of the most powerful spellcasters to have ever lived. He was thoroughly evil. His spellbook, also known as The Tome of the Unicorn is known to bear enormous power, the kind that can destroy entire worlds. He died many thousands of years ago, and his spellbook has been sought after for either nefarious purposes or for protection and concealment since then.
Despite having been in the possession of many good, powerful magic users, no-one has yet determined how to destroy it.
He is rumoured to have actually been emperor Shoon VII, but this has never been confirmed.