The Forgotten Tower is the fourth quest in Act I: The Sightless Eye of Diablo II. Unlike the other quests in Act I, it is activated by reading a book rather than by talking to an NPC. The book, known as the Moldy Tome, can be found on a stone pedestal in Stony Field. The book relays the story of a ruined castle in the wilderness that was once inhabited by a wealthy, yet evil Countess. The forgotten tower can be revisited any time, and it is a good place to level-up hirelings if being played in Lord of Destruction. Note that the treasure chest only opens when the player is on the quest.