The Arreat Summit is the peak of Mount Arreat and the location of both the Ancients and the entrance to the Worldstone Keep, the final dungeon in Act 5. At the centre of the summit area is the Altar of the Heavens - when touched, it will awaken the guardians Talic, Madawc and Korlic, whose defeat is required to open the way to the Worldstone Keep.

The only other enemy to dwell in the Arreat Summit is Narthal, whose defeat opens the way (on Hell difficulty) to the Arreat Summit a few millennia ago, where the player is transformed into Diablo and reenacts his battle against King Koth and the Bear Shamans.

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