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Title: Diablo IV - Hall of the Penitent - Tormented Echo of Grigoire, the Galvanic Saint
Description:
The Tormented Echo of Grigoire, the Galvanic Saint is one of the powerful boss monsters that you can summon in any of the Torment difficulty levels. He can be found in the Hall of the Penitent, which is located in the Orbei Monastery in the Dry Steppes. Defeating him grants you powerful equipment. You need 12 Living Steel to summon him. You also have to beat him for for the "Lair: Grigoire, the Galvanic Saint" whisper.

Link: https://www.digioso.org/d4_hall_of_the_penitent