Hills of Barovia
This old wizard wears dark, tattered robes. His black hair and beard are long and unkempt with thick streaks of grey. His eyes crackling with eldritch power.
It is thought that this man is the legendary Mordenkainen, archmage of Oerth, leader of a powerful group of adventurers called the Circle of Eight.
What is known for sure is a mage in black robes arrived in Barovia a year ago. He rallied a bunch of villages in a raid on the Castle Ravenloft. When Strahd and his minions appeared what few villagers remained to fight never returned. Strahd himself fought the mage in an epic battle resulting the the mage being thrown 1000 feet from the Tser Waterfall. His body was never found.