The announcement that the Echoing Nightmare will be sticking from MeadeDorian's blog

In the past, the Echoing Nightmare was only available to characters who were seasonal and had players who had to fight the increasingly powerful spirits of fallen Nephalem warriors to earn greater rewards D2R ladder items. To get access to the Echoing Nightmare, players need to have acquired a Petrified Scream from an Greater Rift Guardian and transmute it into Kanai's Cube to gain access to the Echoing Nightmare. 

The announcement that the Echoing Nightmare will be sticking around for good comes on Diablo's 10th anniversary, which Blizzard are also celebrating by offering a double bounty which will last until season's end. Once you have completed five bounties, you can claim them in the same Act. 

The players will be awarded an increase of twice the number of Horadric caches as usual. Blizzard has not revealed exactly when Season 26 will end, however, previous seasons have run between 17-18 weeks. Season 26 began on April 15. 

Blizzard is set to launch the free-to-play Diablo Immortal, the first mobile game in the series on June 2. The game will play on PC and mobile devices buy d2r items. It will offer cross-play and cross-progression between different platforms.