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Title: Diablo IV - Den of the Blighted Malignant Tunnel
Description:
Den of the Blighted is located just outside the Ruins of Rakhat Keep: Inner Court waypoint, to the northeast. Like every other Malignant Tunnel, it's a hole in the ground. The player has to visit this tunnel for the Hope's Guardian season qust during the first season of Diablo IV. Malignant Tunnels were introduced in the first season of Diablo 4 - The Season of the Malignant. In these you can get Malignant Hearts which you can socket into your jewely slots instead of gems. These hearts can give a wide variety of different bonuses like faster attack speed or making your critial strikes hit harder whereas your non-critical hits do less damage. There are hearts that can be used by all classes, but also class-specific hearts.

Link: https://www.digioso.com/d4_den_of_the_blighted