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Title: Diablo IV - Vessel of Hatred - Ancient's Seat / Tormented Echo of Lord Zir
Description:
The Tormented Echo of Lord Zir is one of the powerful boss monsters that you can summon in any of the Torment difficulty levels. It can be found in the Ancient's Seat in the Darkened Way in the Fractured Peaks. You need 12 Exquisite Blood to summon him. These uber bosses drop summoning items for other bosses as well as equipment.

Link: https://www.digioso.org/d4_ancients_seat