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Diablo Wiki
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An Act Boss is simply the boss monster you must defeat at the end of each Act. In Diablo II They appear in the following order:

  1. Andariel
  2. Duriel
  3. Mephisto
  4. Diablo
  5. Baal

Their deaths grants you access to the following Act. Depending whether you have Diablo II: Lord of Destruction or not, you have to kill Normal Baal or Diablo to have access to Nightmare, and you have to kill Nightmare Baal or Diablo to have access to Hell.

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