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The Altar of Extraction is tied to the Diablo 4 PvP end-game.
The Altar of Extraction allows players to convert their Seeds of Hatred to Red Dust which can then be redeemed at the PvP Cosmetic and Mount Vendors for ornamental rewards.
The Altar of Extraction will be a strategic location when killing other players. Players will be alerted when other players are using the Altar of Extraction making it a dangerous location.