All summonable bosses are now available at Level 200 as Tormented Echoes. Summonable with their regular summon Materials alongside Stygian Stones—which can be found deep within The Pit—these bosses cost more to summon but drop far more rewards. To summon a Tormented Echo, simply go to their typical summon location and select the Tormented Echo variant. Note that to summon the Beast in Ice, you’ll need to craft a different Nightmare Dungeon Sigil.
All items dropped from Tormented Echoes will be Item Level 925. Defeating your first Tormented Echo drops one Resplendent Spark as a first-time reward (account bound).