A One-Round Living Greyhawk Gran March Regional Adventure
From the introduction:
A year has passed since the awakening of the Watcher Helerain Brogan and the retrieval of his restless soul from its tomb. Now the Watcher's ancient enemy the Baklunish lich Feyza Bahun has been found and Watcher Brogan is calling upon all those who have sworn an oath to destroy the lich to aid him. Finding a lich's lair is difficult enough, but most would question the wisdom of those who voluntarily enter one and expect to leave alive.
An Extremely Dangerous Gran March regional adventure for APLs 2-12 and Part Three and the conclusion of the War of the Undying series.