HEROES OF IMPILTUR
An enormously powerful lich that once ruled the nation of Vaasa. Zhengyi was once a Red Wizard of Thay, but later became an enormously powerful lich when he became a servant of the demon prince Orcus. He reputedly created the infamous Castle Perilous in the northern wastes of Vaasa in just one night. His undead legions repeatedly threatened the neighboring nation of Damara until he was defeated by their king Gareth Dragonsbane over one hundred years ago. The Witch-King was recently spotted in Vaasa again but the heroes believe this was just a ruse by Mansard Kanaoth.
First Appearance: Level 13 (mentioned only)