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While within an Echoing Nightmare, the difficulty scales as players progress in the encounter.
Similar to a boss encounter, all players in a multiplayer game must accept a prompt to enter. Only one player is required to transmute a Petrified Scream to open an Echoing Nightmare in a multiplayer game. Petrified Screams and the Echoing Nightmare can only be accessed with seasonal characters. Transmuting a Petrified Scream in Kanai’s Cube summons a portal that players can enter to face the horrors of the Nephalem’s past. Players must collect a Petrified Scream from defeated Greater Rift Guardians to gain entry to the Echoing Nightmare.
Today’s Nephalem must stand their ground until they are inevitably Overwhelmed or defeated. Season 26 introduces the Echoing Nightmare, an optional and rewarding end-game challenge where players fight within the memories of Nephalem who fell in a Greater Rift.