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[[Image:Mon-duriel.jpg|frame|left]]Duriel is the boss of [[Act Two]], and must be defeated to advance to [[Act Three]]. He's found in the one true [[Tomb of Tal Rasha]], and reached by inserting the completed [[Horadric Staff]] into the orifice. Characters who descend through the tunnel opened by this event will encounter Duriel in a small, pit-like level where the demon's speed and charging ability can be put to merciless use. Duriel must be defeated to complete the [[Quests_Act_Two#Quest_Six:_The_Seven_Tombs|last quest in Act Two]], before moving on to Act Three is possible.