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Blighted Sewer is a special area in Diablo III Adventure Mode, accessible only when there is a bounty associated with it, which can occur in any Act. It is reached through a portal that appears somewhere in that act. There are four possible events to appear in this zone:

The same set of events can also occur in Leoric's Gardens, The Killing Grounds, The Archives, Nephalem Proving Ground or The Bound Keep.

Visually, it is a large combat arena in the Sewers of Caldeum. Its layout suggests that originally it might have been a PvP battleground.

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