Ravenloft: Curse of Strahd
Lives alone on the north shore of Lake Zarovich
The Mad Mage of Mount Baratok (who’s name is Mordenkainen) came to Barovia more than a year ago to free its people from Strahd’s tyranny, but he underestimated Strahd’s hold over the land and the creatures in it. After a battle between the two in Castle Ravenloft, Strahd drove the Mad Mage to the mountains and sent the wizard hurling over Tser Falls. Until the party intervened, he had forgotten his name and the world whence he came.
Unfortunately, he said he would not be able to offer the party assistance in fighting Strahd until he recovered his missing staff and spellbook.