The Kingdom of Lith
Yaztromo is a powerful mage who is currently wanted by the King of Talar for treason. It is rumoured that Yaztromo released a spellplague upon the capital city of Vandor, turning a large percentage of its population into murderous savages. Yaztromo fled the city and made a lair in the Deepwitch Caverns. Lately he has been seen on a black horse on the Moor, looking over Vandor. The King thinks he may be aiding the Drow with a plot to bring war upon Vandor and needs the adventurers to go to the Deepwitch Caverns and capture the mage.