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Diablo Wiki
Quest Giver Deckard Cain
Dungeon Level Hell Level 16
Goal Kill Diablo
Reward Completes the game
Multiplayer? Yes

This final quest in Diablo I involves the Dark Lord of Terror himself. This quest is initiated by Deckard Cain anytime after killing Archbishop Lazarus. The pentagram symbol on the fifteenth level of the dungeon turns into a portal to the sixteenth level, the lair of Diablo himself. It is filled with Advocates and Blood Knights, including the unique knight Sir Gorash. There are four corner rooms, only one of which is accessible at first. Pulling the skull lever in that room opens the second, and pulling the lever in the second room opens the third. The third room has two skull levers and both must be pulled to open the fourth and final room. In this room, there is a pentagram on the floor, and it is heavily guarded. A row of Blood Knights forms the outer defense with Advocates behind them. In the very center of the room is an enemy denoted as "The Dark Lord", which is Diablo himself. Surprisingly, he is not a unique monster. He uses the mighty Apocalypse spell, and cannot be Stone Cursed. Defeating him completes the quest, and the game ends in victory.

Multiplayer Mode

This quest is one of the four Diablo quests to appear in Multiplayer mode. Like in Single Player, it is triggered by Deckard Cain after Archbishop Lazarus is killed, but this time, level 16 is much larger. The four rooms are still in the same place, however, and Diablo still has his Blood Knights and Advocates as personal defenders. The Multiplayer game will shut down as soon as Diablo is destroyed, treating the player to the ending cutscene.

Quest Activation Dialog

Deckard Cain: "Your story is quite grim, my friend. Lazarus will surely burn in Hell for his horrific deed. The boy that you describe is NOT our Prince, but I believe that Albrecht may yet be in danger. The symbol of power that you speak of must be a portal in the very heart of the Labyrinth. Know this, my friend - the Evil that you move against is the Dark Lord of Terror. He is known to mortal men as Diablo. It was he who was imprisoned within the labyrinth many centuries ago and I fear that he seeks to once again sow chaos in the Realm of Mankind. You must venture through the portal and destroy Diablo before it is too late!"